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IB/srp: Fix residual handling
[deliverable/linux.git] / drivers / infiniband / ulp / srp / ib_srp.c
CommitLineData
aef9ec39
RD		 1/*
2 * Copyright (c) 2005 Cisco Systems. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
aef9ec39
RD		 31 */
32
d236cd0e 33#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
e0bda7d8 34
aef9ec39
RD		 35#include <linux/module.h>
36#include <linux/init.h>
37#include <linux/slab.h>
38#include <linux/err.h>
39#include <linux/string.h>
40#include <linux/parser.h>
41#include <linux/random.h>
de25968c 42#include <linux/jiffies.h>
aef9ec39 43
60063497 44#include <linux/atomic.h>
aef9ec39
RD		 45
46#include <scsi/scsi.h>
47#include <scsi/scsi_device.h>
48#include <scsi/scsi_dbg.h>
71444b97 49#include <scsi/scsi_tcq.h>
aef9ec39 50#include <scsi/srp.h>
3236822b 51#include <scsi/scsi_transport_srp.h>
aef9ec39 52
aef9ec39
RD		 53#include "ib_srp.h"
54
55#define DRV_NAME "ib_srp"
56#define PFX DRV_NAME ": "
e8ca4135
VP		 57#define DRV_VERSION "1.0"
58#define DRV_RELDATE "July 1, 2013"
aef9ec39
RD		 59
60MODULE_AUTHOR("Roland Dreier");
61MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
62 "v" DRV_VERSION " (" DRV_RELDATE ")");
63MODULE_LICENSE("Dual BSD/GPL");
64
49248644
DD		 65static unsigned int srp_sg_tablesize;
66static unsigned int cmd_sg_entries;
c07d424d
DD		 67static unsigned int indirect_sg_entries;
68static bool allow_ext_sg;
5cfb1782 69static bool prefer_fr;
b1b8854d 70static bool register_always;
49248644 71static int topspin_workarounds = 1;
74b0a15b 72
49248644
DD		 73module_param(srp_sg_tablesize, uint, 0444);
74MODULE_PARM_DESC(srp_sg_tablesize, "Deprecated name for cmd_sg_entries");
74b0a15b 75
49248644
DD		 76module_param(cmd_sg_entries, uint, 0444);
77MODULE_PARM_DESC(cmd_sg_entries,
78 "Default number of gather/scatter entries in the SRP command (default is 12, max 255)");
aef9ec39 79
c07d424d
DD		 80module_param(indirect_sg_entries, uint, 0444);
81MODULE_PARM_DESC(indirect_sg_entries,
82 "Default max number of gather/scatter entries (default is 12, max is " __stringify(SCSI_MAX_SG_CHAIN_SEGMENTS) ")");
83
84module_param(allow_ext_sg, bool, 0444);
85MODULE_PARM_DESC(allow_ext_sg,
86 "Default behavior when there are more than cmd_sg_entries S/G entries after mapping; fails the request when false (default false)");
87
aef9ec39
RD		 88module_param(topspin_workarounds, int, 0444);
89MODULE_PARM_DESC(topspin_workarounds,
90 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
91
5cfb1782
BVA		 92module_param(prefer_fr, bool, 0444);
93MODULE_PARM_DESC(prefer_fr,
94"Whether to use fast registration if both FMR and fast registration are supported");
95
b1b8854d
BVA		 96module_param(register_always, bool, 0444);
97MODULE_PARM_DESC(register_always,
98 "Use memory registration even for contiguous memory regions");
99
ed9b2264
BVA		 100static struct kernel_param_ops srp_tmo_ops;
101
a95cadb9
BVA		 102static int srp_reconnect_delay = 10;
103module_param_cb(reconnect_delay, &srp_tmo_ops, &srp_reconnect_delay,
104 S_IRUGO | S_IWUSR);
105MODULE_PARM_DESC(reconnect_delay, "Time between successive reconnect attempts");
106
ed9b2264
BVA		 107static int srp_fast_io_fail_tmo = 15;
108module_param_cb(fast_io_fail_tmo, &srp_tmo_ops, &srp_fast_io_fail_tmo,
109 S_IRUGO | S_IWUSR);
110MODULE_PARM_DESC(fast_io_fail_tmo,
111 "Number of seconds between the observation of a transport"
112 " layer error and failing all I/O. \"off\" means that this"
113 " functionality is disabled.");
114
a95cadb9 115static int srp_dev_loss_tmo = 600;
ed9b2264
BVA		 116module_param_cb(dev_loss_tmo, &srp_tmo_ops, &srp_dev_loss_tmo,
117 S_IRUGO | S_IWUSR);
118MODULE_PARM_DESC(dev_loss_tmo,
119 "Maximum number of seconds that the SRP transport should"
120 " insulate transport layer errors. After this time has been"
121 " exceeded the SCSI host is removed. Should be"
122 " between 1 and " __stringify(SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
123 " if fast_io_fail_tmo has not been set. \"off\" means that"
124 " this functionality is disabled.");
125
aef9ec39
RD		 126static void srp_add_one(struct ib_device *device);
127static void srp_remove_one(struct ib_device *device);
9c03dc9f
BVA		 128static void srp_recv_completion(struct ib_cq *cq, void *target_ptr);
129static void srp_send_completion(struct ib_cq *cq, void *target_ptr);
aef9ec39
RD		 130static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
131
3236822b 132static struct scsi_transport_template *ib_srp_transport_template;
bcc05910 133static struct workqueue_struct *srp_remove_wq;
3236822b 134
aef9ec39
RD		 135static struct ib_client srp_client = {
136 .name = "srp",
137 .add = srp_add_one,
138 .remove = srp_remove_one
139};
140
c1a0b23b
MT		 141static struct ib_sa_client srp_sa_client;
142
ed9b2264
BVA		 143static int srp_tmo_get(char *buffer, const struct kernel_param *kp)
144{
145 int tmo = *(int *)kp->arg;
146
147 if (tmo >= 0)
148 return sprintf(buffer, "%d", tmo);
149 else
150 return sprintf(buffer, "off");
151}
152
153static int srp_tmo_set(const char *val, const struct kernel_param *kp)
154{
155 int tmo, res;
156
157 if (strncmp(val, "off", 3) != 0) {
158 res = kstrtoint(val, 0, &tmo);
159 if (res)
160 goto out;
161 } else {
162 tmo = -1;
163 }
a95cadb9
BVA		 164 if (kp->arg == &srp_reconnect_delay)
165 res = srp_tmo_valid(tmo, srp_fast_io_fail_tmo,
166 srp_dev_loss_tmo);
167 else if (kp->arg == &srp_fast_io_fail_tmo)
168 res = srp_tmo_valid(srp_reconnect_delay, tmo, srp_dev_loss_tmo);
ed9b2264 169 else
a95cadb9
BVA		 170 res = srp_tmo_valid(srp_reconnect_delay, srp_fast_io_fail_tmo,
171 tmo);
ed9b2264
BVA		 172 if (res)
173 goto out;
174 *(int *)kp->arg = tmo;
175
176out:
177 return res;
178}
179
180static struct kernel_param_ops srp_tmo_ops = {
181 .get = srp_tmo_get,
182 .set = srp_tmo_set,
183};
184
aef9ec39
RD		 185static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
186{
187 return (struct srp_target_port *) host->hostdata;
188}
189
190static const char *srp_target_info(struct Scsi_Host *host)
191{
192 return host_to_target(host)->target_name;
193}
194
5d7cbfd6
RD		 195static int srp_target_is_topspin(struct srp_target_port *target)
196{
197 static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
3d1ff48d 198 static const u8 cisco_oui[3] = { 0x00, 0x1b, 0x0d };
5d7cbfd6
RD		 199
200 return topspin_workarounds &&
3d1ff48d
RK		 201 (!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) ||
202 !memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui));
5d7cbfd6
RD		 203}
204
aef9ec39
RD		 205static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
206 gfp_t gfp_mask,
207 enum dma_data_direction direction)
208{
209 struct srp_iu *iu;
210
211 iu = kmalloc(sizeof *iu, gfp_mask);
212 if (!iu)
213 goto out;
214
215 iu->buf = kzalloc(size, gfp_mask);
216 if (!iu->buf)
217 goto out_free_iu;
218
05321937
GKH		 219 iu->dma = ib_dma_map_single(host->srp_dev->dev, iu->buf, size,
220 direction);
221 if (ib_dma_mapping_error(host->srp_dev->dev, iu->dma))
aef9ec39
RD		 222 goto out_free_buf;
223
224 iu->size = size;
225 iu->direction = direction;
226
227 return iu;
228
229out_free_buf:
230 kfree(iu->buf);
231out_free_iu:
232 kfree(iu);
233out:
234 return NULL;
235}
236
237static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
238{
239 if (!iu)
240 return;
241
05321937
GKH		 242 ib_dma_unmap_single(host->srp_dev->dev, iu->dma, iu->size,
243 iu->direction);
aef9ec39
RD		 244 kfree(iu->buf);
245 kfree(iu);
246}
247
248static void srp_qp_event(struct ib_event *event, void *context)
249{
e0bda7d8 250 pr_debug("QP event %d\n", event->event);
aef9ec39
RD		 251}
252
253static int srp_init_qp(struct srp_target_port *target,
254 struct ib_qp *qp)
255{
256 struct ib_qp_attr *attr;
257 int ret;
258
259 attr = kmalloc(sizeof *attr, GFP_KERNEL);
260 if (!attr)
261 return -ENOMEM;
262
969a60f9
RD		 263 ret = ib_find_pkey(target->srp_host->srp_dev->dev,
264 target->srp_host->port,
265 be16_to_cpu(target->path.pkey),
266 &attr->pkey_index);
aef9ec39
RD		 267 if (ret)
268 goto out;
269
270 attr->qp_state = IB_QPS_INIT;
271 attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
272 IB_ACCESS_REMOTE_WRITE);
273 attr->port_num = target->srp_host->port;
274
275 ret = ib_modify_qp(qp, attr,
276 IB_QP_STATE |
277 IB_QP_PKEY_INDEX |
278 IB_QP_ACCESS_FLAGS |
279 IB_QP_PORT);
280
281out:
282 kfree(attr);
283 return ret;
284}
285
9fe4bcf4
DD		 286static int srp_new_cm_id(struct srp_target_port *target)
287{
288 struct ib_cm_id *new_cm_id;
289
05321937 290 new_cm_id = ib_create_cm_id(target->srp_host->srp_dev->dev,
9fe4bcf4
DD		 291 srp_cm_handler, target);
292 if (IS_ERR(new_cm_id))
293 return PTR_ERR(new_cm_id);
294
295 if (target->cm_id)
296 ib_destroy_cm_id(target->cm_id);
297 target->cm_id = new_cm_id;
298
299 return 0;
300}
301
d1b4289e
BVA		 302static struct ib_fmr_pool *srp_alloc_fmr_pool(struct srp_target_port *target)
303{
304 struct srp_device *dev = target->srp_host->srp_dev;
305 struct ib_fmr_pool_param fmr_param;
306
307 memset(&fmr_param, 0, sizeof(fmr_param));
308 fmr_param.pool_size = target->scsi_host->can_queue;
309 fmr_param.dirty_watermark = fmr_param.pool_size / 4;
310 fmr_param.cache = 1;
52ede08f
BVA		 311 fmr_param.max_pages_per_fmr = dev->max_pages_per_mr;
312 fmr_param.page_shift = ilog2(dev->mr_page_size);
d1b4289e
BVA		 313 fmr_param.access = (IB_ACCESS_LOCAL_WRITE |
314 IB_ACCESS_REMOTE_WRITE |
315 IB_ACCESS_REMOTE_READ);
316
317 return ib_create_fmr_pool(dev->pd, &fmr_param);
318}
319
5cfb1782
BVA		 320/**
321 * srp_destroy_fr_pool() - free the resources owned by a pool
322 * @pool: Fast registration pool to be destroyed.
323 */
324static void srp_destroy_fr_pool(struct srp_fr_pool *pool)
325{
326 int i;
327 struct srp_fr_desc *d;
328
329 if (!pool)
330 return;
331
332 for (i = 0, d = &pool->desc[0]; i < pool->size; i++, d++) {
333 if (d->frpl)
334 ib_free_fast_reg_page_list(d->frpl);
335 if (d->mr)
336 ib_dereg_mr(d->mr);
337 }
338 kfree(pool);
339}
340
341/**
342 * srp_create_fr_pool() - allocate and initialize a pool for fast registration
343 * @device: IB device to allocate fast registration descriptors for.
344 * @pd: Protection domain associated with the FR descriptors.
345 * @pool_size: Number of descriptors to allocate.
346 * @max_page_list_len: Maximum fast registration work request page list length.
347 */
348static struct srp_fr_pool *srp_create_fr_pool(struct ib_device *device,
349 struct ib_pd *pd, int pool_size,
350 int max_page_list_len)
351{
352 struct srp_fr_pool *pool;
353 struct srp_fr_desc *d;
354 struct ib_mr *mr;
355 struct ib_fast_reg_page_list *frpl;
356 int i, ret = -EINVAL;
357
358 if (pool_size <= 0)
359 goto err;
360 ret = -ENOMEM;
361 pool = kzalloc(sizeof(struct srp_fr_pool) +
362 pool_size * sizeof(struct srp_fr_desc), GFP_KERNEL);
363 if (!pool)
364 goto err;
365 pool->size = pool_size;
366 pool->max_page_list_len = max_page_list_len;
367 spin_lock_init(&pool->lock);
368 INIT_LIST_HEAD(&pool->free_list);
369
370 for (i = 0, d = &pool->desc[0]; i < pool->size; i++, d++) {
371 mr = ib_alloc_fast_reg_mr(pd, max_page_list_len);
372 if (IS_ERR(mr)) {
373 ret = PTR_ERR(mr);
374 goto destroy_pool;
375 }
376 d->mr = mr;
377 frpl = ib_alloc_fast_reg_page_list(device, max_page_list_len);
378 if (IS_ERR(frpl)) {
379 ret = PTR_ERR(frpl);
380 goto destroy_pool;
381 }
382 d->frpl = frpl;
383 list_add_tail(&d->entry, &pool->free_list);
384 }
385
386out:
387 return pool;
388
389destroy_pool:
390 srp_destroy_fr_pool(pool);
391
392err:
393 pool = ERR_PTR(ret);
394 goto out;
395}
396
397/**
398 * srp_fr_pool_get() - obtain a descriptor suitable for fast registration
399 * @pool: Pool to obtain descriptor from.
400 */
401static struct srp_fr_desc *srp_fr_pool_get(struct srp_fr_pool *pool)
402{
403 struct srp_fr_desc *d = NULL;
404 unsigned long flags;
405
406 spin_lock_irqsave(&pool->lock, flags);
407 if (!list_empty(&pool->free_list)) {
408 d = list_first_entry(&pool->free_list, typeof(*d), entry);
409 list_del(&d->entry);
410 }
411 spin_unlock_irqrestore(&pool->lock, flags);
412
413 return d;
414}
415
416/**
417 * srp_fr_pool_put() - put an FR descriptor back in the free list
418 * @pool: Pool the descriptor was allocated from.
419 * @desc: Pointer to an array of fast registration descriptor pointers.
420 * @n: Number of descriptors to put back.
421 *
422 * Note: The caller must already have queued an invalidation request for
423 * desc->mr->rkey before calling this function.
424 */
425static void srp_fr_pool_put(struct srp_fr_pool *pool, struct srp_fr_desc **desc,
426 int n)
427{
428 unsigned long flags;
429 int i;
430
431 spin_lock_irqsave(&pool->lock, flags);
432 for (i = 0; i < n; i++)
433 list_add(&desc[i]->entry, &pool->free_list);
434 spin_unlock_irqrestore(&pool->lock, flags);
435}
436
437static struct srp_fr_pool *srp_alloc_fr_pool(struct srp_target_port *target)
438{
439 struct srp_device *dev = target->srp_host->srp_dev;
440
441 return srp_create_fr_pool(dev->dev, dev->pd,
442 target->scsi_host->can_queue,
443 dev->max_pages_per_mr);
444}
445
aef9ec39
RD		 446static int srp_create_target_ib(struct srp_target_port *target)
447{
62154b2e 448 struct srp_device *dev = target->srp_host->srp_dev;
aef9ec39 449 struct ib_qp_init_attr *init_attr;
73aa89ed
IR		 450 struct ib_cq *recv_cq, *send_cq;
451 struct ib_qp *qp;
d1b4289e 452 struct ib_fmr_pool *fmr_pool = NULL;
5cfb1782
BVA		 453 struct srp_fr_pool *fr_pool = NULL;
454 const int m = 1 + dev->use_fast_reg;
aef9ec39
RD		 455 int ret;
456
457 init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
458 if (!init_attr)
459 return -ENOMEM;
460
62154b2e 461 recv_cq = ib_create_cq(dev->dev, srp_recv_completion, NULL, target,
4d73f95f 462 target->queue_size, target->comp_vector);
73aa89ed
IR		 463 if (IS_ERR(recv_cq)) {
464 ret = PTR_ERR(recv_cq);
da9d2f07 465 goto err;
aef9ec39
RD		 466 }
467
62154b2e 468 send_cq = ib_create_cq(dev->dev, srp_send_completion, NULL, target,
5cfb1782 469 m * target->queue_size, target->comp_vector);
73aa89ed
IR		 470 if (IS_ERR(send_cq)) {
471 ret = PTR_ERR(send_cq);
da9d2f07 472 goto err_recv_cq;
9c03dc9f
BVA		 473 }
474
73aa89ed 475 ib_req_notify_cq(recv_cq, IB_CQ_NEXT_COMP);
aef9ec39
RD		 476
477 init_attr->event_handler = srp_qp_event;
5cfb1782 478 init_attr->cap.max_send_wr = m * target->queue_size;
4d73f95f 479 init_attr->cap.max_recv_wr = target->queue_size;
aef9ec39
RD		 480 init_attr->cap.max_recv_sge = 1;
481 init_attr->cap.max_send_sge = 1;
5cfb1782 482 init_attr->sq_sig_type = IB_SIGNAL_REQ_WR;
aef9ec39 483 init_attr->qp_type = IB_QPT_RC;
73aa89ed
IR		 484 init_attr->send_cq = send_cq;
485 init_attr->recv_cq = recv_cq;
aef9ec39 486
62154b2e 487 qp = ib_create_qp(dev->pd, init_attr);
73aa89ed
IR		 488 if (IS_ERR(qp)) {
489 ret = PTR_ERR(qp);
da9d2f07 490 goto err_send_cq;
aef9ec39
RD		 491 }
492
73aa89ed 493 ret = srp_init_qp(target, qp);
da9d2f07
RD		 494 if (ret)
495 goto err_qp;
aef9ec39 496
5cfb1782
BVA		 497 if (dev->use_fast_reg && dev->has_fr) {
498 fr_pool = srp_alloc_fr_pool(target);
499 if (IS_ERR(fr_pool)) {
500 ret = PTR_ERR(fr_pool);
501 shost_printk(KERN_WARNING, target->scsi_host, PFX
502 "FR pool allocation failed (%d)\n", ret);
503 goto err_qp;
504 }
505 if (target->fr_pool)
506 srp_destroy_fr_pool(target->fr_pool);
507 target->fr_pool = fr_pool;
508 } else if (!dev->use_fast_reg && dev->has_fmr) {
d1b4289e
BVA		 509 fmr_pool = srp_alloc_fmr_pool(target);
510 if (IS_ERR(fmr_pool)) {
511 ret = PTR_ERR(fmr_pool);
512 shost_printk(KERN_WARNING, target->scsi_host, PFX
513 "FMR pool allocation failed (%d)\n", ret);
514 goto err_qp;
515 }
516 if (target->fmr_pool)
517 ib_destroy_fmr_pool(target->fmr_pool);
518 target->fmr_pool = fmr_pool;
519 }
520
73aa89ed
IR		 521 if (target->qp)
522 ib_destroy_qp(target->qp);
523 if (target->recv_cq)
524 ib_destroy_cq(target->recv_cq);
525 if (target->send_cq)
526 ib_destroy_cq(target->send_cq);
527
528 target->qp = qp;
529 target->recv_cq = recv_cq;
530 target->send_cq = send_cq;
531
da9d2f07
RD		 532 kfree(init_attr);
533 return 0;
534
535err_qp:
73aa89ed 536 ib_destroy_qp(qp);
da9d2f07
RD		 537
538err_send_cq:
73aa89ed 539 ib_destroy_cq(send_cq);
da9d2f07
RD		 540
541err_recv_cq:
73aa89ed 542 ib_destroy_cq(recv_cq);
da9d2f07
RD		 543
544err:
aef9ec39
RD		 545 kfree(init_attr);
546 return ret;
547}
548
4d73f95f
BVA		 549/*
550 * Note: this function may be called without srp_alloc_iu_bufs() having been
551 * invoked. Hence the target->[rt]x_ring checks.
552 */
aef9ec39
RD		 553static void srp_free_target_ib(struct srp_target_port *target)
554{
5cfb1782 555 struct srp_device *dev = target->srp_host->srp_dev;
aef9ec39
RD		 556 int i;
557
5cfb1782
BVA		 558 if (dev->use_fast_reg) {
559 if (target->fr_pool)
560 srp_destroy_fr_pool(target->fr_pool);
561 } else {
562 if (target->fmr_pool)
563 ib_destroy_fmr_pool(target->fmr_pool);
564 }
aef9ec39 565 ib_destroy_qp(target->qp);
9c03dc9f
BVA		 566 ib_destroy_cq(target->send_cq);
567 ib_destroy_cq(target->recv_cq);
aef9ec39 568
73aa89ed
IR		 569 target->qp = NULL;
570 target->send_cq = target->recv_cq = NULL;
571
4d73f95f
BVA		 572 if (target->rx_ring) {
573 for (i = 0; i < target->queue_size; ++i)
574 srp_free_iu(target->srp_host, target->rx_ring[i]);
575 kfree(target->rx_ring);
576 target->rx_ring = NULL;
577 }
578 if (target->tx_ring) {
579 for (i = 0; i < target->queue_size; ++i)
580 srp_free_iu(target->srp_host, target->tx_ring[i]);
581 kfree(target->tx_ring);
582 target->tx_ring = NULL;
583 }
aef9ec39
RD		 584}
585
586static void srp_path_rec_completion(int status,
587 struct ib_sa_path_rec *pathrec,
588 void *target_ptr)
589{
590 struct srp_target_port *target = target_ptr;
591
592 target->status = status;
593 if (status)
7aa54bd7
DD		 594 shost_printk(KERN_ERR, target->scsi_host,
595 PFX "Got failed path rec status %d\n", status);
aef9ec39
RD		 596 else
597 target->path = *pathrec;
598 complete(&target->done);
599}
600
601static int srp_lookup_path(struct srp_target_port *target)
602{
a702adce
BVA		 603 int ret;
604
aef9ec39
RD		 605 target->path.numb_path = 1;
606
607 init_completion(&target->done);
608
c1a0b23b 609 target->path_query_id = ib_sa_path_rec_get(&srp_sa_client,
05321937 610 target->srp_host->srp_dev->dev,
aef9ec39
RD		 611 target->srp_host->port,
612 &target->path,
247e020e 613 IB_SA_PATH_REC_SERVICE_ID |
aef9ec39
RD		 614 IB_SA_PATH_REC_DGID |
615 IB_SA_PATH_REC_SGID |
616 IB_SA_PATH_REC_NUMB_PATH |
617 IB_SA_PATH_REC_PKEY,
618 SRP_PATH_REC_TIMEOUT_MS,
619 GFP_KERNEL,
620 srp_path_rec_completion,
621 target, &target->path_query);
622 if (target->path_query_id < 0)
623 return target->path_query_id;
624
a702adce
BVA		 625 ret = wait_for_completion_interruptible(&target->done);
626 if (ret < 0)
627 return ret;
aef9ec39
RD		 628
629 if (target->status < 0)
7aa54bd7
DD		 630 shost_printk(KERN_WARNING, target->scsi_host,
631 PFX "Path record query failed\n");
aef9ec39
RD		 632
633 return target->status;
634}
635
636static int srp_send_req(struct srp_target_port *target)
637{
638 struct {
639 struct ib_cm_req_param param;
640 struct srp_login_req priv;
641 } *req = NULL;
642 int status;
643
644 req = kzalloc(sizeof *req, GFP_KERNEL);
645 if (!req)
646 return -ENOMEM;
647
648 req->param.primary_path = &target->path;
649 req->param.alternate_path = NULL;
650 req->param.service_id = target->service_id;
651 req->param.qp_num = target->qp->qp_num;
652 req->param.qp_type = target->qp->qp_type;
653 req->param.private_data = &req->priv;
654 req->param.private_data_len = sizeof req->priv;
655 req->param.flow_control = 1;
656
657 get_random_bytes(&req->param.starting_psn, 4);
658 req->param.starting_psn &= 0xffffff;
659
660 /*
661 * Pick some arbitrary defaults here; we could make these
662 * module parameters if anyone cared about setting them.
663 */
664 req->param.responder_resources = 4;
665 req->param.remote_cm_response_timeout = 20;
666 req->param.local_cm_response_timeout = 20;
7bb312e4 667 req->param.retry_count = target->tl_retry_count;
aef9ec39
RD		 668 req->param.rnr_retry_count = 7;
669 req->param.max_cm_retries = 15;
670
671 req->priv.opcode = SRP_LOGIN_REQ;
672 req->priv.tag = 0;
49248644 673 req->priv.req_it_iu_len = cpu_to_be32(target->max_iu_len);
aef9ec39
RD		 674 req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
675 SRP_BUF_FORMAT_INDIRECT);
0c0450db 676 /*
3cd96564 677 * In the published SRP specification (draft rev. 16a), the
0c0450db
R		 678 * port identifier format is 8 bytes of ID extension followed
679 * by 8 bytes of GUID. Older drafts put the two halves in the
680 * opposite order, so that the GUID comes first.
681 *
682 * Targets conforming to these obsolete drafts can be
683 * recognized by the I/O Class they report.
684 */
685 if (target->io_class == SRP_REV10_IB_IO_CLASS) {
686 memcpy(req->priv.initiator_port_id,
01cb9bcb 687 &target->path.sgid.global.interface_id, 8);
0c0450db 688 memcpy(req->priv.initiator_port_id + 8,
01cb9bcb 689 &target->initiator_ext, 8);
0c0450db
R		 690 memcpy(req->priv.target_port_id, &target->ioc_guid, 8);
691 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
692 } else {
693 memcpy(req->priv.initiator_port_id,
01cb9bcb
IR		 694 &target->initiator_ext, 8);
695 memcpy(req->priv.initiator_port_id + 8,
696 &target->path.sgid.global.interface_id, 8);
0c0450db
R		 697 memcpy(req->priv.target_port_id, &target->id_ext, 8);
698 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
699 }
700
aef9ec39
RD		 701 /*
702 * Topspin/Cisco SRP targets will reject our login unless we
01cb9bcb
IR		 703 * zero out the first 8 bytes of our initiator port ID and set
704 * the second 8 bytes to the local node GUID.
aef9ec39 705 */
5d7cbfd6 706 if (srp_target_is_topspin(target)) {
7aa54bd7
DD		 707 shost_printk(KERN_DEBUG, target->scsi_host,
708 PFX "Topspin/Cisco initiator port ID workaround "
709 "activated for target GUID %016llx\n",
710 (unsigned long long) be64_to_cpu(target->ioc_guid));
aef9ec39 711 memset(req->priv.initiator_port_id, 0, 8);
01cb9bcb 712 memcpy(req->priv.initiator_port_id + 8,
05321937 713 &target->srp_host->srp_dev->dev->node_guid, 8);
aef9ec39 714 }
aef9ec39
RD		 715
716 status = ib_send_cm_req(target->cm_id, &req->param);
717
718 kfree(req);
719
720 return status;
721}
722
ef6c49d8
BVA		 723static bool srp_queue_remove_work(struct srp_target_port *target)
724{
725 bool changed = false;
726
727 spin_lock_irq(&target->lock);
728 if (target->state != SRP_TARGET_REMOVED) {
729 target->state = SRP_TARGET_REMOVED;
730 changed = true;
731 }
732 spin_unlock_irq(&target->lock);
733
734 if (changed)
bcc05910 735 queue_work(srp_remove_wq, &target->remove_work);
ef6c49d8
BVA		 736
737 return changed;
738}
739
294c875a
BVA		 740static bool srp_change_conn_state(struct srp_target_port *target,
741 bool connected)
742{
743 bool changed = false;
744
745 spin_lock_irq(&target->lock);
746 if (target->connected != connected) {
747 target->connected = connected;
748 changed = true;
749 }
750 spin_unlock_irq(&target->lock);
751
752 return changed;
753}
754
aef9ec39
RD		 755static void srp_disconnect_target(struct srp_target_port *target)
756{
294c875a
BVA		 757 if (srp_change_conn_state(target, false)) {
758 /* XXX should send SRP_I_LOGOUT request */
aef9ec39 759
294c875a
BVA		 760 if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
761 shost_printk(KERN_DEBUG, target->scsi_host,
762 PFX "Sending CM DREQ failed\n");
294c875a 763 }
e6581056 764 }
aef9ec39
RD		 765}
766
8f26c9ff
DD		 767static void srp_free_req_data(struct srp_target_port *target)
768{
5cfb1782
BVA		 769 struct srp_device *dev = target->srp_host->srp_dev;
770 struct ib_device *ibdev = dev->dev;
8f26c9ff
DD		 771 struct srp_request *req;
772 int i;
773
4d73f95f
BVA		 774 if (!target->req_ring)
775 return;
776
777 for (i = 0; i < target->req_ring_size; ++i) {
778 req = &target->req_ring[i];
5cfb1782
BVA		 779 if (dev->use_fast_reg)
780 kfree(req->fr_list);
781 else
782 kfree(req->fmr_list);
8f26c9ff 783 kfree(req->map_page);
c07d424d
DD		 784 if (req->indirect_dma_addr) {
785 ib_dma_unmap_single(ibdev, req->indirect_dma_addr,
786 target->indirect_size,
787 DMA_TO_DEVICE);
788 }
789 kfree(req->indirect_desc);
8f26c9ff 790 }
4d73f95f
BVA		 791
792 kfree(target->req_ring);
793 target->req_ring = NULL;
8f26c9ff
DD		 794}
795
b81d00bd
BVA		 796static int srp_alloc_req_data(struct srp_target_port *target)
797{
798 struct srp_device *srp_dev = target->srp_host->srp_dev;
799 struct ib_device *ibdev = srp_dev->dev;
800 struct srp_request *req;
5cfb1782 801 void *mr_list;
b81d00bd
BVA		 802 dma_addr_t dma_addr;
803 int i, ret = -ENOMEM;
804
805 INIT_LIST_HEAD(&target->free_reqs);
806
4d73f95f
BVA		 807 target->req_ring = kzalloc(target->req_ring_size *
808 sizeof(*target->req_ring), GFP_KERNEL);
809 if (!target->req_ring)
810 goto out;
811
812 for (i = 0; i < target->req_ring_size; ++i) {
b81d00bd 813 req = &target->req_ring[i];
5cfb1782
BVA		 814 mr_list = kmalloc(target->cmd_sg_cnt * sizeof(void *),
815 GFP_KERNEL);
816 if (!mr_list)
817 goto out;
818 if (srp_dev->use_fast_reg)
819 req->fr_list = mr_list;
820 else
821 req->fmr_list = mr_list;
52ede08f 822 req->map_page = kmalloc(srp_dev->max_pages_per_mr *
d1b4289e 823 sizeof(void *), GFP_KERNEL);
5cfb1782
BVA		 824 if (!req->map_page)
825 goto out;
b81d00bd 826 req->indirect_desc = kmalloc(target->indirect_size, GFP_KERNEL);
5cfb1782 827 if (!req->indirect_desc)
b81d00bd
BVA		 828 goto out;
829
830 dma_addr = ib_dma_map_single(ibdev, req->indirect_desc,
831 target->indirect_size,
832 DMA_TO_DEVICE);
833 if (ib_dma_mapping_error(ibdev, dma_addr))
834 goto out;
835
836 req->indirect_dma_addr = dma_addr;
837 req->index = i;
838 list_add_tail(&req->list, &target->free_reqs);
839 }
840 ret = 0;
841
842out:
843 return ret;
844}
845
683b159a
BVA		 846/**
847 * srp_del_scsi_host_attr() - Remove attributes defined in the host template.
848 * @shost: SCSI host whose attributes to remove from sysfs.
849 *
850 * Note: Any attributes defined in the host template and that did not exist
851 * before invocation of this function will be ignored.
852 */
853static void srp_del_scsi_host_attr(struct Scsi_Host *shost)
854{
855 struct device_attribute **attr;
856
857 for (attr = shost->hostt->shost_attrs; attr && *attr; ++attr)
858 device_remove_file(&shost->shost_dev, *attr);
859}
860
ee12d6a8
BVA		 861static void srp_remove_target(struct srp_target_port *target)
862{
ef6c49d8
BVA		 863 WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);
864
ee12d6a8 865 srp_del_scsi_host_attr(target->scsi_host);
9dd69a60 866 srp_rport_get(target->rport);
ee12d6a8
BVA		 867 srp_remove_host(target->scsi_host);
868 scsi_remove_host(target->scsi_host);
93079162 869 srp_stop_rport_timers(target->rport);
ef6c49d8 870 srp_disconnect_target(target);
ee12d6a8
BVA		 871 ib_destroy_cm_id(target->cm_id);
872 srp_free_target_ib(target);
c1120f89 873 cancel_work_sync(&target->tl_err_work);
9dd69a60 874 srp_rport_put(target->rport);
ee12d6a8 875 srp_free_req_data(target);
65d7dd2f
VP		 876
877 spin_lock(&target->srp_host->target_lock);
878 list_del(&target->list);
879 spin_unlock(&target->srp_host->target_lock);
880
ee12d6a8
BVA		 881 scsi_host_put(target->scsi_host);
882}
883
c4028958 884static void srp_remove_work(struct work_struct *work)
aef9ec39 885{
c4028958 886 struct srp_target_port *target =
ef6c49d8 887 container_of(work, struct srp_target_port, remove_work);
aef9ec39 888
ef6c49d8 889 WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);
aef9ec39 890
96fc248a 891 srp_remove_target(target);
aef9ec39
RD		 892}
893
dc1bdbd9
BVA		 894static void srp_rport_delete(struct srp_rport *rport)
895{
896 struct srp_target_port *target = rport->lld_data;
897
898 srp_queue_remove_work(target);
899}
900
aef9ec39
RD		 901static int srp_connect_target(struct srp_target_port *target)
902{
9fe4bcf4 903 int retries = 3;
aef9ec39
RD		 904 int ret;
905
294c875a
BVA		 906 WARN_ON_ONCE(target->connected);
907
948d1e88
BVA		 908 target->qp_in_error = false;
909
aef9ec39
RD		 910 ret = srp_lookup_path(target);
911 if (ret)
912 return ret;
913
914 while (1) {
915 init_completion(&target->done);
916 ret = srp_send_req(target);
917 if (ret)
918 return ret;
a702adce
BVA		 919 ret = wait_for_completion_interruptible(&target->done);
920 if (ret < 0)
921 return ret;
aef9ec39
RD		 922
923 /*
924 * The CM event handling code will set status to
925 * SRP_PORT_REDIRECT if we get a port redirect REJ
926 * back, or SRP_DLID_REDIRECT if we get a lid/qp
927 * redirect REJ back.
928 */
929 switch (target->status) {
930 case 0:
294c875a 931 srp_change_conn_state(target, true);
aef9ec39
RD		 932 return 0;
933
934 case SRP_PORT_REDIRECT:
935 ret = srp_lookup_path(target);
936 if (ret)
937 return ret;
938 break;
939
940 case SRP_DLID_REDIRECT:
941 break;
942
9fe4bcf4
DD		 943 case SRP_STALE_CONN:
944 /* Our current CM id was stale, and is now in timewait.
945 * Try to reconnect with a new one.
946 */
947 if (!retries-- || srp_new_cm_id(target)) {
948 shost_printk(KERN_ERR, target->scsi_host, PFX
949 "giving up on stale connection\n");
950 target->status = -ECONNRESET;
951 return target->status;
952 }
953
954 shost_printk(KERN_ERR, target->scsi_host, PFX
955 "retrying stale connection\n");
956 break;
957
aef9ec39
RD		 958 default:
959 return target->status;
960 }
961 }
962}
963
5cfb1782
BVA		 964static int srp_inv_rkey(struct srp_target_port *target, u32 rkey)
965{
966 struct ib_send_wr *bad_wr;
967 struct ib_send_wr wr = {
968 .opcode = IB_WR_LOCAL_INV,
969 .wr_id = LOCAL_INV_WR_ID_MASK,
970 .next = NULL,
971 .num_sge = 0,
972 .send_flags = 0,
973 .ex.invalidate_rkey = rkey,
974 };
975
976 return ib_post_send(target->qp, &wr, &bad_wr);
977}
978
d945e1df
RD		 979static void srp_unmap_data(struct scsi_cmnd *scmnd,
980 struct srp_target_port *target,
981 struct srp_request *req)
982{
5cfb1782
BVA		 983 struct srp_device *dev = target->srp_host->srp_dev;
984 struct ib_device *ibdev = dev->dev;
985 int i, res;
8f26c9ff 986
bb350d1d 987 if (!scsi_sglist(scmnd) ||
d945e1df
RD		 988 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
989 scmnd->sc_data_direction != DMA_FROM_DEVICE))
990 return;
991
5cfb1782
BVA		 992 if (dev->use_fast_reg) {
993 struct srp_fr_desc **pfr;
994
995 for (i = req->nmdesc, pfr = req->fr_list; i > 0; i--, pfr++) {
996 res = srp_inv_rkey(target, (*pfr)->mr->rkey);
997 if (res < 0) {
998 shost_printk(KERN_ERR, target->scsi_host, PFX
999 "Queueing INV WR for rkey %#x failed (%d)\n",
1000 (*pfr)->mr->rkey, res);
1001 queue_work(system_long_wq,
1002 &target->tl_err_work);
1003 }
1004 }
1005 if (req->nmdesc)
1006 srp_fr_pool_put(target->fr_pool, req->fr_list,
1007 req->nmdesc);
1008 } else {
1009 struct ib_pool_fmr **pfmr;
1010
1011 for (i = req->nmdesc, pfmr = req->fmr_list; i > 0; i--, pfmr++)
1012 ib_fmr_pool_unmap(*pfmr);
1013 }
f5358a17 1014
8f26c9ff
DD		 1015 ib_dma_unmap_sg(ibdev, scsi_sglist(scmnd), scsi_sg_count(scmnd),
1016 scmnd->sc_data_direction);
d945e1df
RD		 1017}
1018
22032991
BVA		 1019/**
1020 * srp_claim_req - Take ownership of the scmnd associated with a request.
1021 * @target: SRP target port.
1022 * @req: SRP request.
b3fe628d 1023 * @sdev: If not NULL, only take ownership for this SCSI device.
22032991
BVA		 1024 * @scmnd: If NULL, take ownership of @req->scmnd. If not NULL, only take
1025 * ownership of @req->scmnd if it equals @scmnd.
1026 *
1027 * Return value:
1028 * Either NULL or a pointer to the SCSI command the caller became owner of.
1029 */
1030static struct scsi_cmnd *srp_claim_req(struct srp_target_port *target,
1031 struct srp_request *req,
b3fe628d 1032 struct scsi_device *sdev,
22032991
BVA		 1033 struct scsi_cmnd *scmnd)
1034{
1035 unsigned long flags;
1036
1037 spin_lock_irqsave(&target->lock, flags);
b3fe628d
BVA		 1038 if (req->scmnd &&
1039 (!sdev || req->scmnd->device == sdev) &&
1040 (!scmnd || req->scmnd == scmnd)) {
22032991
BVA		 1041 scmnd = req->scmnd;
1042 req->scmnd = NULL;
22032991
BVA		 1043 } else {
1044 scmnd = NULL;
1045 }
1046 spin_unlock_irqrestore(&target->lock, flags);
1047
1048 return scmnd;
1049}
1050
1051/**
1052 * srp_free_req() - Unmap data and add request to the free request list.
af24663b
BVA		 1053 * @target: SRP target port.
1054 * @req: Request to be freed.
1055 * @scmnd: SCSI command associated with @req.
1056 * @req_lim_delta: Amount to be added to @target->req_lim.
22032991
BVA		 1057 */
1058static void srp_free_req(struct srp_target_port *target,
1059 struct srp_request *req, struct scsi_cmnd *scmnd,
1060 s32 req_lim_delta)
526b4caa 1061{
94a9174c
BVA		 1062 unsigned long flags;
1063
22032991
BVA		 1064 srp_unmap_data(scmnd, target, req);
1065
e9684678 1066 spin_lock_irqsave(&target->lock, flags);
94a9174c 1067 target->req_lim += req_lim_delta;
536ae14e 1068 list_add_tail(&req->list, &target->free_reqs);
e9684678 1069 spin_unlock_irqrestore(&target->lock, flags);
526b4caa
IR		 1070}
1071
ed9b2264 1072static void srp_finish_req(struct srp_target_port *target,
b3fe628d
BVA		 1073 struct srp_request *req, struct scsi_device *sdev,
1074 int result)
526b4caa 1075{
b3fe628d 1076 struct scsi_cmnd *scmnd = srp_claim_req(target, req, sdev, NULL);
22032991
BVA		 1077
1078 if (scmnd) {
9b796d06 1079 srp_free_req(target, req, scmnd, 0);
ed9b2264 1080 scmnd->result = result;
22032991 1081 scmnd->scsi_done(scmnd);
22032991 1082 }
526b4caa
IR		 1083}
1084
ed9b2264 1085static void srp_terminate_io(struct srp_rport *rport)
aef9ec39 1086{
ed9b2264 1087 struct srp_target_port *target = rport->lld_data;
b3fe628d
BVA		 1088 struct Scsi_Host *shost = target->scsi_host;
1089 struct scsi_device *sdev;
ed9b2264
BVA		 1090 int i;
1091
b3fe628d
BVA		 1092 /*
1093 * Invoking srp_terminate_io() while srp_queuecommand() is running
1094 * is not safe. Hence the warning statement below.
1095 */
1096 shost_for_each_device(sdev, shost)
1097 WARN_ON_ONCE(sdev->request_queue->request_fn_active);
1098
4d73f95f 1099 for (i = 0; i < target->req_ring_size; ++i) {
ed9b2264 1100 struct srp_request *req = &target->req_ring[i];
b3fe628d 1101 srp_finish_req(target, req, NULL, DID_TRANSPORT_FAILFAST << 16);
ed9b2264
BVA		 1102 }
1103}
aef9ec39 1104
ed9b2264
BVA		 1105/*
1106 * It is up to the caller to ensure that srp_rport_reconnect() calls are
1107 * serialized and that no concurrent srp_queuecommand(), srp_abort(),
1108 * srp_reset_device() or srp_reset_host() calls will occur while this function
1109 * is in progress. One way to realize that is not to call this function
1110 * directly but to call srp_reconnect_rport() instead since that last function
1111 * serializes calls of this function via rport->mutex and also blocks
1112 * srp_queuecommand() calls before invoking this function.
1113 */
1114static int srp_rport_reconnect(struct srp_rport *rport)
1115{
1116 struct srp_target_port *target = rport->lld_data;
1117 int i, ret;
09be70a2 1118
aef9ec39
RD		 1119 srp_disconnect_target(target);
1120 /*
c7c4e7ff
BVA		 1121 * Now get a new local CM ID so that we avoid confusing the target in
1122 * case things are really fouled up. Doing so also ensures that all CM
1123 * callbacks will have finished before a new QP is allocated.
aef9ec39 1124 */
9fe4bcf4 1125 ret = srp_new_cm_id(target);
aef9ec39 1126
4d73f95f 1127 for (i = 0; i < target->req_ring_size; ++i) {
536ae14e 1128 struct srp_request *req = &target->req_ring[i];
b3fe628d 1129 srp_finish_req(target, req, NULL, DID_RESET << 16);
536ae14e 1130 }
aef9ec39 1131
5cfb1782
BVA		 1132 /*
1133 * Whether or not creating a new CM ID succeeded, create a new
1134 * QP. This guarantees that all callback functions for the old QP have
1135 * finished before any send requests are posted on the new QP.
1136 */
1137 ret += srp_create_target_ib(target);
1138
536ae14e 1139 INIT_LIST_HEAD(&target->free_tx);
4d73f95f 1140 for (i = 0; i < target->queue_size; ++i)
536ae14e 1141 list_add(&target->tx_ring[i]->list, &target->free_tx);
aef9ec39 1142
c7c4e7ff
BVA		 1143 if (ret == 0)
1144 ret = srp_connect_target(target);
09be70a2 1145
ed9b2264
BVA		 1146 if (ret == 0)
1147 shost_printk(KERN_INFO, target->scsi_host,
1148 PFX "reconnect succeeded\n");
aef9ec39
RD		 1149
1150 return ret;
1151}
1152
8f26c9ff
DD		 1153static void srp_map_desc(struct srp_map_state *state, dma_addr_t dma_addr,
1154 unsigned int dma_len, u32 rkey)
f5358a17 1155{
8f26c9ff 1156 struct srp_direct_buf *desc = state->desc;
f5358a17 1157
8f26c9ff
DD		 1158 desc->va = cpu_to_be64(dma_addr);
1159 desc->key = cpu_to_be32(rkey);
1160 desc->len = cpu_to_be32(dma_len);
f5358a17 1161
8f26c9ff
DD		 1162 state->total_len += dma_len;
1163 state->desc++;
1164 state->ndesc++;
1165}
559ce8f1 1166
8f26c9ff
DD		 1167static int srp_map_finish_fmr(struct srp_map_state *state,
1168 struct srp_target_port *target)
1169{
8f26c9ff
DD		 1170 struct ib_pool_fmr *fmr;
1171 u64 io_addr = 0;
85507bcc 1172
d1b4289e 1173 fmr = ib_fmr_pool_map_phys(target->fmr_pool, state->pages,
8f26c9ff
DD		 1174 state->npages, io_addr);
1175 if (IS_ERR(fmr))
1176 return PTR_ERR(fmr);
f5358a17 1177
8f26c9ff 1178 *state->next_fmr++ = fmr;
52ede08f 1179 state->nmdesc++;
f5358a17 1180
52ede08f 1181 srp_map_desc(state, 0, state->dma_len, fmr->fmr->rkey);
539dde6f 1182
8f26c9ff
DD		 1183 return 0;
1184}
1185
5cfb1782
BVA		 1186static int srp_map_finish_fr(struct srp_map_state *state,
1187 struct srp_target_port *target)
1188{
1189 struct srp_device *dev = target->srp_host->srp_dev;
1190 struct ib_send_wr *bad_wr;
1191 struct ib_send_wr wr;
1192 struct srp_fr_desc *desc;
1193 u32 rkey;
1194
1195 desc = srp_fr_pool_get(target->fr_pool);
1196 if (!desc)
1197 return -ENOMEM;
1198
1199 rkey = ib_inc_rkey(desc->mr->rkey);
1200 ib_update_fast_reg_key(desc->mr, rkey);
1201
1202 memcpy(desc->frpl->page_list, state->pages,
1203 sizeof(state->pages[0]) * state->npages);
1204
1205 memset(&wr, 0, sizeof(wr));
1206 wr.opcode = IB_WR_FAST_REG_MR;
1207 wr.wr_id = FAST_REG_WR_ID_MASK;
1208 wr.wr.fast_reg.iova_start = state->base_dma_addr;
1209 wr.wr.fast_reg.page_list = desc->frpl;
1210 wr.wr.fast_reg.page_list_len = state->npages;
1211 wr.wr.fast_reg.page_shift = ilog2(dev->mr_page_size);
1212 wr.wr.fast_reg.length = state->dma_len;
1213 wr.wr.fast_reg.access_flags = (IB_ACCESS_LOCAL_WRITE |
1214 IB_ACCESS_REMOTE_READ |
1215 IB_ACCESS_REMOTE_WRITE);
1216 wr.wr.fast_reg.rkey = desc->mr->lkey;
1217
1218 *state->next_fr++ = desc;
1219 state->nmdesc++;
1220
1221 srp_map_desc(state, state->base_dma_addr, state->dma_len,
1222 desc->mr->rkey);
1223
1224 return ib_post_send(target->qp, &wr, &bad_wr);
1225}
1226
539dde6f
BVA		 1227static int srp_finish_mapping(struct srp_map_state *state,
1228 struct srp_target_port *target)
1229{
1230 int ret = 0;
1231
1232 if (state->npages == 0)
1233 return 0;
1234
b1b8854d 1235 if (state->npages == 1 && !register_always)
52ede08f 1236 srp_map_desc(state, state->base_dma_addr, state->dma_len,
539dde6f
BVA		 1237 target->rkey);
1238 else
5cfb1782
BVA		 1239 ret = target->srp_host->srp_dev->use_fast_reg ?
1240 srp_map_finish_fr(state, target) :
1241 srp_map_finish_fmr(state, target);
539dde6f
BVA		 1242
1243 if (ret == 0) {
1244 state->npages = 0;
52ede08f 1245 state->dma_len = 0;
539dde6f
BVA		 1246 }
1247
1248 return ret;
1249}
1250
8f26c9ff
DD		 1251static void srp_map_update_start(struct srp_map_state *state,
1252 struct scatterlist *sg, int sg_index,
1253 dma_addr_t dma_addr)
1254{
1255 state->unmapped_sg = sg;
1256 state->unmapped_index = sg_index;
1257 state->unmapped_addr = dma_addr;
1258}
85507bcc 1259
8f26c9ff
DD		 1260static int srp_map_sg_entry(struct srp_map_state *state,
1261 struct srp_target_port *target,
1262 struct scatterlist *sg, int sg_index,
5cfb1782 1263 bool use_mr)
8f26c9ff
DD		 1264{
1265 struct srp_device *dev = target->srp_host->srp_dev;
1266 struct ib_device *ibdev = dev->dev;
1267 dma_addr_t dma_addr = ib_sg_dma_address(ibdev, sg);
1268 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
1269 unsigned int len;
1270 int ret;
1271
1272 if (!dma_len)
1273 return 0;
1274
5cfb1782
BVA		 1275 if (!use_mr) {
1276 /*
1277 * Once we're in direct map mode for a request, we don't
1278 * go back to FMR or FR mode, so no need to update anything
8f26c9ff
DD		 1279 * other than the descriptor.
1280 */
1281 srp_map_desc(state, dma_addr, dma_len, target->rkey);
1282 return 0;
85507bcc 1283 }
f5358a17 1284
5cfb1782
BVA		 1285 /*
1286 * Since not all RDMA HW drivers support non-zero page offsets for
1287 * FMR, if we start at an offset into a page, don't merge into the
1288 * current FMR mapping. Finish it out, and use the kernel's MR for
1289 * this sg entry.
8f26c9ff 1290 */
5cfb1782
BVA		 1291 if ((!dev->use_fast_reg && dma_addr & ~dev->mr_page_mask) ||
1292 dma_len > dev->mr_max_size) {
539dde6f 1293 ret = srp_finish_mapping(state, target);
8f26c9ff
DD		 1294 if (ret)
1295 return ret;
1296
1297 srp_map_desc(state, dma_addr, dma_len, target->rkey);
1298 srp_map_update_start(state, NULL, 0, 0);
1299 return 0;
f5358a17
RD		 1300 }
1301
5cfb1782
BVA		 1302 /*
1303 * If this is the first sg that will be mapped via FMR or via FR, save
1304 * our position. We need to know the first unmapped entry, its index,
1305 * and the first unmapped address within that entry to be able to
1306 * restart mapping after an error.
8f26c9ff
DD		 1307 */
1308 if (!state->unmapped_sg)
1309 srp_map_update_start(state, sg, sg_index, dma_addr);
f5358a17 1310
8f26c9ff 1311 while (dma_len) {
5cfb1782
BVA		 1312 unsigned offset = dma_addr & ~dev->mr_page_mask;
1313 if (state->npages == dev->max_pages_per_mr || offset != 0) {
539dde6f 1314 ret = srp_finish_mapping(state, target);
8f26c9ff
DD		 1315 if (ret)
1316 return ret;
f5358a17 1317
8f26c9ff
DD		 1318 srp_map_update_start(state, sg, sg_index, dma_addr);
1319 }
1320
5cfb1782 1321 len = min_t(unsigned int, dma_len, dev->mr_page_size - offset);
f5358a17 1322
8f26c9ff
DD		 1323 if (!state->npages)
1324 state->base_dma_addr = dma_addr;
5cfb1782 1325 state->pages[state->npages++] = dma_addr & dev->mr_page_mask;
52ede08f 1326 state->dma_len += len;
8f26c9ff
DD		 1327 dma_addr += len;
1328 dma_len -= len;
1329 }
1330
5cfb1782
BVA		 1331 /*
1332 * If the last entry of the MR wasn't a full page, then we need to
8f26c9ff
DD		 1333 * close it out and start a new one -- we can only merge at page
1334 * boundries.
1335 */
1336 ret = 0;
52ede08f 1337 if (len != dev->mr_page_size) {
539dde6f 1338 ret = srp_finish_mapping(state, target);
8f26c9ff
DD		 1339 if (!ret)
1340 srp_map_update_start(state, NULL, 0, 0);
1341 }
f5358a17
RD		 1342 return ret;
1343}
1344
5cfb1782
BVA		 1345static int srp_map_sg(struct srp_map_state *state,
1346 struct srp_target_port *target, struct srp_request *req,
1347 struct scatterlist *scat, int count)
76bc1e1d
BVA		 1348{
1349 struct srp_device *dev = target->srp_host->srp_dev;
1350 struct ib_device *ibdev = dev->dev;
1351 struct scatterlist *sg;
5cfb1782
BVA		 1352 int i;
1353 bool use_mr;
76bc1e1d
BVA		 1354
1355 state->desc = req->indirect_desc;
1356 state->pages = req->map_page;
5cfb1782
BVA		 1357 if (dev->use_fast_reg) {
1358 state->next_fr = req->fr_list;
1359 use_mr = !!target->fr_pool;
1360 } else {
1361 state->next_fmr = req->fmr_list;
1362 use_mr = !!target->fmr_pool;
1363 }
76bc1e1d
BVA		 1364
1365 for_each_sg(scat, sg, count, i) {
5cfb1782
BVA		 1366 if (srp_map_sg_entry(state, target, sg, i, use_mr)) {
1367 /*
1368 * Memory registration failed, so backtrack to the
1369 * first unmapped entry and continue on without using
1370 * memory registration.
76bc1e1d
BVA		 1371 */
1372 dma_addr_t dma_addr;
1373 unsigned int dma_len;
1374
1375backtrack:
1376 sg = state->unmapped_sg;
1377 i = state->unmapped_index;
1378
1379 dma_addr = ib_sg_dma_address(ibdev, sg);
1380 dma_len = ib_sg_dma_len(ibdev, sg);
1381 dma_len -= (state->unmapped_addr - dma_addr);
1382 dma_addr = state->unmapped_addr;
5cfb1782 1383 use_mr = false;
76bc1e1d
BVA		 1384 srp_map_desc(state, dma_addr, dma_len, target->rkey);
1385 }
1386 }
1387
5cfb1782 1388 if (use_mr && srp_finish_mapping(state, target))
76bc1e1d
BVA		 1389 goto backtrack;
1390
52ede08f 1391 req->nmdesc = state->nmdesc;
5cfb1782
BVA		 1392
1393 return 0;
76bc1e1d
BVA		 1394}
1395
aef9ec39
RD		 1396static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
1397 struct srp_request *req)
1398{
76bc1e1d 1399 struct scatterlist *scat;
aef9ec39 1400 struct srp_cmd *cmd = req->cmd->buf;
76bc1e1d 1401 int len, nents, count;
85507bcc
RC		 1402 struct srp_device *dev;
1403 struct ib_device *ibdev;
8f26c9ff
DD		 1404 struct srp_map_state state;
1405 struct srp_indirect_buf *indirect_hdr;
8f26c9ff
DD		 1406 u32 table_len;
1407 u8 fmt;
aef9ec39 1408
bb350d1d 1409 if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
aef9ec39
RD		 1410 return sizeof (struct srp_cmd);
1411
1412 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
1413 scmnd->sc_data_direction != DMA_TO_DEVICE) {
7aa54bd7
DD		 1414 shost_printk(KERN_WARNING, target->scsi_host,
1415 PFX "Unhandled data direction %d\n",
1416 scmnd->sc_data_direction);
aef9ec39
RD		 1417 return -EINVAL;
1418 }
1419
bb350d1d
FT		 1420 nents = scsi_sg_count(scmnd);
1421 scat = scsi_sglist(scmnd);
aef9ec39 1422
05321937 1423 dev = target->srp_host->srp_dev;
85507bcc
RC		 1424 ibdev = dev->dev;
1425
1426 count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
8f26c9ff
DD		 1427 if (unlikely(count == 0))
1428 return -EIO;
f5358a17
RD		 1429
1430 fmt = SRP_DATA_DESC_DIRECT;
1431 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
aef9ec39 1432
b1b8854d 1433 if (count == 1 && !register_always) {
f5358a17
RD		 1434 /*
1435 * The midlayer only generated a single gather/scatter
1436 * entry, or DMA mapping coalesced everything to a
1437 * single entry. So a direct descriptor along with
1438 * the DMA MR suffices.
1439 */
cf368713 1440 struct srp_direct_buf *buf = (void *) cmd->add_data;
aef9ec39 1441
85507bcc 1442 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
9af76271 1443 buf->key = cpu_to_be32(target->rkey);
85507bcc 1444 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
8f26c9ff 1445
52ede08f 1446 req->nmdesc = 0;
8f26c9ff
DD		 1447 goto map_complete;
1448 }
1449
5cfb1782
BVA		 1450 /*
1451 * We have more than one scatter/gather entry, so build our indirect
1452 * descriptor table, trying to merge as many entries as we can.
8f26c9ff
DD		 1453 */
1454 indirect_hdr = (void *) cmd->add_data;
1455
c07d424d
DD		 1456 ib_dma_sync_single_for_cpu(ibdev, req->indirect_dma_addr,
1457 target->indirect_size, DMA_TO_DEVICE);
1458
8f26c9ff 1459 memset(&state, 0, sizeof(state));
5cfb1782 1460 srp_map_sg(&state, target, req, scat, count);
cf368713 1461
c07d424d
DD		 1462 /* We've mapped the request, now pull as much of the indirect
1463 * descriptor table as we can into the command buffer. If this
1464 * target is not using an external indirect table, we are
1465 * guaranteed to fit into the command, as the SCSI layer won't
1466 * give us more S/G entries than we allow.
8f26c9ff 1467 */
8f26c9ff 1468 if (state.ndesc == 1) {
5cfb1782
BVA		 1469 /*
1470 * Memory registration collapsed the sg-list into one entry,
8f26c9ff
DD		 1471 * so use a direct descriptor.
1472 */
1473 struct srp_direct_buf *buf = (void *) cmd->add_data;
cf368713 1474
c07d424d 1475 *buf = req->indirect_desc[0];
8f26c9ff 1476 goto map_complete;
aef9ec39
RD		 1477 }
1478
c07d424d
DD		 1479 if (unlikely(target->cmd_sg_cnt < state.ndesc &&
1480 !target->allow_ext_sg)) {
1481 shost_printk(KERN_ERR, target->scsi_host,
1482 "Could not fit S/G list into SRP_CMD\n");
1483 return -EIO;
1484 }
1485
1486 count = min(state.ndesc, target->cmd_sg_cnt);
8f26c9ff
DD		 1487 table_len = state.ndesc * sizeof (struct srp_direct_buf);
1488
1489 fmt = SRP_DATA_DESC_INDIRECT;
1490 len = sizeof(struct srp_cmd) + sizeof (struct srp_indirect_buf);
c07d424d 1491 len += count * sizeof (struct srp_direct_buf);
8f26c9ff 1492
c07d424d
DD		 1493 memcpy(indirect_hdr->desc_list, req->indirect_desc,
1494 count * sizeof (struct srp_direct_buf));
8f26c9ff 1495
c07d424d 1496 indirect_hdr->table_desc.va = cpu_to_be64(req->indirect_dma_addr);
8f26c9ff
DD		 1497 indirect_hdr->table_desc.key = cpu_to_be32(target->rkey);
1498 indirect_hdr->table_desc.len = cpu_to_be32(table_len);
1499 indirect_hdr->len = cpu_to_be32(state.total_len);
1500
1501 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
c07d424d 1502 cmd->data_out_desc_cnt = count;
8f26c9ff 1503 else
c07d424d
DD		 1504 cmd->data_in_desc_cnt = count;
1505
1506 ib_dma_sync_single_for_device(ibdev, req->indirect_dma_addr, table_len,
1507 DMA_TO_DEVICE);
8f26c9ff
DD		 1508
1509map_complete:
aef9ec39
RD		 1510 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
1511 cmd->buf_fmt = fmt << 4;
1512 else
1513 cmd->buf_fmt = fmt;
1514
aef9ec39
RD		 1515 return len;
1516}
1517
76c75b25
BVA		 1518/*
1519 * Return an IU and possible credit to the free pool
1520 */
1521static void srp_put_tx_iu(struct srp_target_port *target, struct srp_iu *iu,
1522 enum srp_iu_type iu_type)
1523{
1524 unsigned long flags;
1525
e9684678 1526 spin_lock_irqsave(&target->lock, flags);
76c75b25
BVA		 1527 list_add(&iu->list, &target->free_tx);
1528 if (iu_type != SRP_IU_RSP)
1529 ++target->req_lim;
e9684678 1530 spin_unlock_irqrestore(&target->lock, flags);
76c75b25
BVA		 1531}
1532
05a1d750 1533/*
e9684678
BVA		 1534 * Must be called with target->lock held to protect req_lim and free_tx.
1535 * If IU is not sent, it must be returned using srp_put_tx_iu().
05a1d750
DD		 1536 *
1537 * Note:
1538 * An upper limit for the number of allocated information units for each
1539 * request type is:
1540 * - SRP_IU_CMD: SRP_CMD_SQ_SIZE, since the SCSI mid-layer never queues
1541 * more than Scsi_Host.can_queue requests.
1542 * - SRP_IU_TSK_MGMT: SRP_TSK_MGMT_SQ_SIZE.
1543 * - SRP_IU_RSP: 1, since a conforming SRP target never sends more than
1544 * one unanswered SRP request to an initiator.
1545 */
1546static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target,
1547 enum srp_iu_type iu_type)
1548{
1549 s32 rsv = (iu_type == SRP_IU_TSK_MGMT) ? 0 : SRP_TSK_MGMT_SQ_SIZE;
1550 struct srp_iu *iu;
1551
1552 srp_send_completion(target->send_cq, target);
1553
dcb4cb85 1554 if (list_empty(&target->free_tx))
05a1d750
DD		 1555 return NULL;
1556
1557 /* Initiator responses to target requests do not consume credits */
76c75b25
BVA		 1558 if (iu_type != SRP_IU_RSP) {
1559 if (target->req_lim <= rsv) {
1560 ++target->zero_req_lim;
1561 return NULL;
1562 }
1563
1564 --target->req_lim;
05a1d750
DD		 1565 }
1566
dcb4cb85 1567 iu = list_first_entry(&target->free_tx, struct srp_iu, list);
76c75b25 1568 list_del(&iu->list);
05a1d750
DD		 1569 return iu;
1570}
1571
76c75b25
BVA		 1572static int srp_post_send(struct srp_target_port *target,
1573 struct srp_iu *iu, int len)
05a1d750
DD		 1574{
1575 struct ib_sge list;
1576 struct ib_send_wr wr, *bad_wr;
05a1d750
DD		 1577
1578 list.addr = iu->dma;
1579 list.length = len;
9af76271 1580 list.lkey = target->lkey;
05a1d750
DD		 1581
1582 wr.next = NULL;
dcb4cb85 1583 wr.wr_id = (uintptr_t) iu;
05a1d750
DD		 1584 wr.sg_list = &list;
1585 wr.num_sge = 1;
1586 wr.opcode = IB_WR_SEND;
1587 wr.send_flags = IB_SEND_SIGNALED;
1588
76c75b25 1589 return ib_post_send(target->qp, &wr, &bad_wr);
05a1d750
DD		 1590}
1591
dcb4cb85 1592static int srp_post_recv(struct srp_target_port *target, struct srp_iu *iu)
c996bb47 1593{
c996bb47 1594 struct ib_recv_wr wr, *bad_wr;
dcb4cb85 1595 struct ib_sge list;
c996bb47
BVA		 1596
1597 list.addr = iu->dma;
1598 list.length = iu->size;
9af76271 1599 list.lkey = target->lkey;
c996bb47
BVA		 1600
1601 wr.next = NULL;
dcb4cb85 1602 wr.wr_id = (uintptr_t) iu;
c996bb47
BVA		 1603 wr.sg_list = &list;
1604 wr.num_sge = 1;
1605
dcb4cb85 1606 return ib_post_recv(target->qp, &wr, &bad_wr);
c996bb47
BVA		 1607}
1608
aef9ec39
RD		 1609static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
1610{
1611 struct srp_request *req;
1612 struct scsi_cmnd *scmnd;
1613 unsigned long flags;
aef9ec39 1614
aef9ec39 1615 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
e9684678 1616 spin_lock_irqsave(&target->lock, flags);
94a9174c 1617 target->req_lim += be32_to_cpu(rsp->req_lim_delta);
e9684678 1618 spin_unlock_irqrestore(&target->lock, flags);
94a9174c 1619
f8b6e31e
DD		 1620 target->tsk_mgmt_status = -1;
1621 if (be32_to_cpu(rsp->resp_data_len) >= 4)
1622 target->tsk_mgmt_status = rsp->data[3];
1623 complete(&target->tsk_mgmt_done);
aef9ec39 1624 } else {
f8b6e31e 1625 req = &target->req_ring[rsp->tag];
b3fe628d 1626 scmnd = srp_claim_req(target, req, NULL, NULL);
22032991 1627 if (!scmnd) {
7aa54bd7
DD		 1628 shost_printk(KERN_ERR, target->scsi_host,
1629 "Null scmnd for RSP w/tag %016llx\n",
1630 (unsigned long long) rsp->tag);
22032991
BVA		 1631
1632 spin_lock_irqsave(&target->lock, flags);
1633 target->req_lim += be32_to_cpu(rsp->req_lim_delta);
1634 spin_unlock_irqrestore(&target->lock, flags);
1635
1636 return;
1637 }
aef9ec39
RD		 1638 scmnd->result = rsp->status;
1639
1640 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
1641 memcpy(scmnd->sense_buffer, rsp->data +
1642 be32_to_cpu(rsp->resp_data_len),
1643 min_t(int, be32_to_cpu(rsp->sense_data_len),
1644 SCSI_SENSE_BUFFERSIZE));
1645 }
1646
e714531a 1647 if (unlikely(rsp->flags & SRP_RSP_FLAG_DIUNDER))
bb350d1d 1648 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
e714531a
BVA		 1649 else if (unlikely(rsp->flags & SRP_RSP_FLAG_DIOVER))
1650 scsi_set_resid(scmnd, -be32_to_cpu(rsp->data_in_res_cnt));
1651 else if (unlikely(rsp->flags & SRP_RSP_FLAG_DOUNDER))
1652 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
1653 else if (unlikely(rsp->flags & SRP_RSP_FLAG_DOOVER))
1654 scsi_set_resid(scmnd, -be32_to_cpu(rsp->data_out_res_cnt));
aef9ec39 1655
22032991
BVA		 1656 srp_free_req(target, req, scmnd,
1657 be32_to_cpu(rsp->req_lim_delta));
1658
f8b6e31e
DD		 1659 scmnd->host_scribble = NULL;
1660 scmnd->scsi_done(scmnd);
aef9ec39 1661 }
aef9ec39
RD		 1662}
1663
bb12588a
DD		 1664static int srp_response_common(struct srp_target_port *target, s32 req_delta,
1665 void *rsp, int len)
1666{
76c75b25 1667 struct ib_device *dev = target->srp_host->srp_dev->dev;
bb12588a
DD		 1668 unsigned long flags;
1669 struct srp_iu *iu;
76c75b25 1670 int err;
bb12588a 1671
e9684678 1672 spin_lock_irqsave(&target->lock, flags);
bb12588a 1673 target->req_lim += req_delta;
bb12588a 1674 iu = __srp_get_tx_iu(target, SRP_IU_RSP);
e9684678 1675 spin_unlock_irqrestore(&target->lock, flags);
76c75b25 1676
bb12588a
DD		 1677 if (!iu) {
1678 shost_printk(KERN_ERR, target->scsi_host, PFX
1679 "no IU available to send response\n");
76c75b25 1680 return 1;
bb12588a
DD		 1681 }
1682
1683 ib_dma_sync_single_for_cpu(dev, iu->dma, len, DMA_TO_DEVICE);
1684 memcpy(iu->buf, rsp, len);
1685 ib_dma_sync_single_for_device(dev, iu->dma, len, DMA_TO_DEVICE);
1686
76c75b25
BVA		 1687 err = srp_post_send(target, iu, len);
1688 if (err) {
bb12588a
DD		 1689 shost_printk(KERN_ERR, target->scsi_host, PFX
1690 "unable to post response: %d\n", err);
76c75b25
BVA		 1691 srp_put_tx_iu(target, iu, SRP_IU_RSP);
1692 }
bb12588a 1693
bb12588a
DD		 1694 return err;
1695}
1696
1697static void srp_process_cred_req(struct srp_target_port *target,
1698 struct srp_cred_req *req)
1699{
1700 struct srp_cred_rsp rsp = {
1701 .opcode = SRP_CRED_RSP,
1702 .tag = req->tag,
1703 };
1704 s32 delta = be32_to_cpu(req->req_lim_delta);
1705
1706 if (srp_response_common(target, delta, &rsp, sizeof rsp))
1707 shost_printk(KERN_ERR, target->scsi_host, PFX
1708 "problems processing SRP_CRED_REQ\n");
1709}
1710
1711static void srp_process_aer_req(struct srp_target_port *target,
1712 struct srp_aer_req *req)
1713{
1714 struct srp_aer_rsp rsp = {
1715 .opcode = SRP_AER_RSP,
1716 .tag = req->tag,
1717 };
1718 s32 delta = be32_to_cpu(req->req_lim_delta);
1719
1720 shost_printk(KERN_ERR, target->scsi_host, PFX
1721 "ignoring AER for LUN %llu\n", be64_to_cpu(req->lun));
1722
1723 if (srp_response_common(target, delta, &rsp, sizeof rsp))
1724 shost_printk(KERN_ERR, target->scsi_host, PFX
1725 "problems processing SRP_AER_REQ\n");
1726}
1727
aef9ec39
RD		 1728static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
1729{
dcb4cb85 1730 struct ib_device *dev = target->srp_host->srp_dev->dev;
737b94eb 1731 struct srp_iu *iu = (struct srp_iu *) (uintptr_t) wc->wr_id;
c996bb47 1732 int res;
aef9ec39
RD		 1733 u8 opcode;
1734
85507bcc
RC		 1735 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
1736 DMA_FROM_DEVICE);
aef9ec39
RD		 1737
1738 opcode = *(u8 *) iu->buf;
1739
1740 if (0) {
7aa54bd7
DD		 1741 shost_printk(KERN_ERR, target->scsi_host,
1742 PFX "recv completion, opcode 0x%02x\n", opcode);
7a700811
BVA		 1743 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1,
1744 iu->buf, wc->byte_len, true);
aef9ec39
RD		 1745 }
1746
1747 switch (opcode) {
1748 case SRP_RSP:
1749 srp_process_rsp(target, iu->buf);
1750 break;
1751
bb12588a
DD		 1752 case SRP_CRED_REQ:
1753 srp_process_cred_req(target, iu->buf);
1754 break;
1755
1756 case SRP_AER_REQ:
1757 srp_process_aer_req(target, iu->buf);
1758 break;
1759
aef9ec39
RD		 1760 case SRP_T_LOGOUT:
1761 /* XXX Handle target logout */
7aa54bd7
DD		 1762 shost_printk(KERN_WARNING, target->scsi_host,
1763 PFX "Got target logout request\n");
aef9ec39
RD		 1764 break;
1765
1766 default:
7aa54bd7
DD		 1767 shost_printk(KERN_WARNING, target->scsi_host,
1768 PFX "Unhandled SRP opcode 0x%02x\n", opcode);
aef9ec39
RD		 1769 break;
1770 }
1771
85507bcc
RC		 1772 ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
1773 DMA_FROM_DEVICE);
c996bb47 1774
dcb4cb85 1775 res = srp_post_recv(target, iu);
c996bb47
BVA		 1776 if (res != 0)
1777 shost_printk(KERN_ERR, target->scsi_host,
1778 PFX "Recv failed with error code %d\n", res);
aef9ec39
RD		 1779}
1780
c1120f89
BVA		 1781/**
1782 * srp_tl_err_work() - handle a transport layer error
af24663b 1783 * @work: Work structure embedded in an SRP target port.
c1120f89
BVA		 1784 *
1785 * Note: This function may get invoked before the rport has been created,
1786 * hence the target->rport test.
1787 */
1788static void srp_tl_err_work(struct work_struct *work)
1789{
1790 struct srp_target_port *target;
1791
1792 target = container_of(work, struct srp_target_port, tl_err_work);
1793 if (target->rport)
1794 srp_start_tl_fail_timers(target->rport);
1795}
1796
5cfb1782
BVA		 1797static void srp_handle_qp_err(u64 wr_id, enum ib_wc_status wc_status,
1798 bool send_err, struct srp_target_port *target)
948d1e88 1799{
294c875a 1800 if (target->connected && !target->qp_in_error) {
5cfb1782
BVA		 1801 if (wr_id & LOCAL_INV_WR_ID_MASK) {
1802 shost_printk(KERN_ERR, target->scsi_host, PFX
1803 "LOCAL_INV failed with status %d\n",
1804 wc_status);
1805 } else if (wr_id & FAST_REG_WR_ID_MASK) {
1806 shost_printk(KERN_ERR, target->scsi_host, PFX
1807 "FAST_REG_MR failed status %d\n",
1808 wc_status);
1809 } else {
1810 shost_printk(KERN_ERR, target->scsi_host,
1811 PFX "failed %s status %d for iu %p\n",
1812 send_err ? "send" : "receive",
1813 wc_status, (void *)(uintptr_t)wr_id);
1814 }
c1120f89 1815 queue_work(system_long_wq, &target->tl_err_work);
4f0af697 1816 }
948d1e88
BVA		 1817 target->qp_in_error = true;
1818}
1819
9c03dc9f 1820static void srp_recv_completion(struct ib_cq *cq, void *target_ptr)
aef9ec39
RD		 1821{
1822 struct srp_target_port *target = target_ptr;
1823 struct ib_wc wc;
aef9ec39
RD		 1824
1825 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
1826 while (ib_poll_cq(cq, 1, &wc) > 0) {
948d1e88
BVA		 1827 if (likely(wc.status == IB_WC_SUCCESS)) {
1828 srp_handle_recv(target, &wc);
1829 } else {
5cfb1782 1830 srp_handle_qp_err(wc.wr_id, wc.status, false, target);
aef9ec39 1831 }
9c03dc9f
BVA		 1832 }
1833}
1834
1835static void srp_send_completion(struct ib_cq *cq, void *target_ptr)
1836{
1837 struct srp_target_port *target = target_ptr;
1838 struct ib_wc wc;
dcb4cb85 1839 struct srp_iu *iu;
9c03dc9f
BVA		 1840
1841 while (ib_poll_cq(cq, 1, &wc) > 0) {
948d1e88
BVA		 1842 if (likely(wc.status == IB_WC_SUCCESS)) {
1843 iu = (struct srp_iu *) (uintptr_t) wc.wr_id;
1844 list_add(&iu->list, &target->free_tx);
1845 } else {
5cfb1782 1846 srp_handle_qp_err(wc.wr_id, wc.status, true, target);
9c03dc9f 1847 }
aef9ec39
RD		 1848 }
1849}
1850
76c75b25 1851static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
aef9ec39 1852{
76c75b25 1853 struct srp_target_port *target = host_to_target(shost);
a95cadb9 1854 struct srp_rport *rport = target->rport;
aef9ec39
RD		 1855 struct srp_request *req;
1856 struct srp_iu *iu;
1857 struct srp_cmd *cmd;
85507bcc 1858 struct ib_device *dev;
76c75b25 1859 unsigned long flags;
d1b4289e 1860 int len, ret;
a95cadb9
BVA		 1861 const bool in_scsi_eh = !in_interrupt() && current == shost->ehandler;
1862
1863 /*
1864 * The SCSI EH thread is the only context from which srp_queuecommand()
1865 * can get invoked for blocked devices (SDEV_BLOCK /
1866 * SDEV_CREATED_BLOCK). Avoid racing with srp_reconnect_rport() by
1867 * locking the rport mutex if invoked from inside the SCSI EH.
1868 */
1869 if (in_scsi_eh)
1870 mutex_lock(&rport->mutex);
aef9ec39 1871
d1b4289e
BVA		 1872 scmnd->result = srp_chkready(target->rport);
1873 if (unlikely(scmnd->result))
1874 goto err;
2ce19e72 1875
e9684678 1876 spin_lock_irqsave(&target->lock, flags);
bb12588a 1877 iu = __srp_get_tx_iu(target, SRP_IU_CMD);
aef9ec39 1878 if (!iu)
695b8349
BVA		 1879 goto err_unlock;
1880
1881 req = list_first_entry(&target->free_reqs, struct srp_request, list);
1882 list_del(&req->list);
1883 spin_unlock_irqrestore(&target->lock, flags);
aef9ec39 1884
05321937 1885 dev = target->srp_host->srp_dev->dev;
49248644 1886 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_iu_len,
85507bcc 1887 DMA_TO_DEVICE);
aef9ec39 1888
f8b6e31e 1889 scmnd->host_scribble = (void *) req;
aef9ec39
RD		 1890
1891 cmd = iu->buf;
1892 memset(cmd, 0, sizeof *cmd);
1893
1894 cmd->opcode = SRP_CMD;
1895 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
d945e1df 1896 cmd->tag = req->index;
aef9ec39
RD		 1897 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
1898
aef9ec39
RD		 1899 req->scmnd = scmnd;
1900 req->cmd = iu;
aef9ec39
RD		 1901
1902 len = srp_map_data(scmnd, target, req);
1903 if (len < 0) {
7aa54bd7 1904 shost_printk(KERN_ERR, target->scsi_host,
d1b4289e
BVA		 1905 PFX "Failed to map data (%d)\n", len);
1906 /*
1907 * If we ran out of memory descriptors (-ENOMEM) because an
1908 * application is queuing many requests with more than
52ede08f 1909 * max_pages_per_mr sg-list elements, tell the SCSI mid-layer
d1b4289e
BVA		 1910 * to reduce queue depth temporarily.
1911 */
1912 scmnd->result = len == -ENOMEM ?
1913 DID_OK << 16 | QUEUE_FULL << 1 : DID_ERROR << 16;
76c75b25 1914 goto err_iu;
aef9ec39
RD		 1915 }
1916
49248644 1917 ib_dma_sync_single_for_device(dev, iu->dma, target->max_iu_len,
85507bcc 1918 DMA_TO_DEVICE);
aef9ec39 1919
76c75b25 1920 if (srp_post_send(target, iu, len)) {
7aa54bd7 1921 shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
aef9ec39
RD		 1922 goto err_unmap;
1923 }
1924
d1b4289e
BVA		 1925 ret = 0;
1926
a95cadb9
BVA		 1927unlock_rport:
1928 if (in_scsi_eh)
1929 mutex_unlock(&rport->mutex);
1930
d1b4289e 1931 return ret;
aef9ec39
RD		 1932
1933err_unmap:
1934 srp_unmap_data(scmnd, target, req);
1935
76c75b25
BVA		 1936err_iu:
1937 srp_put_tx_iu(target, iu, SRP_IU_CMD);
1938
024ca901
BVA		 1939 /*
1940 * Avoid that the loops that iterate over the request ring can
1941 * encounter a dangling SCSI command pointer.
1942 */
1943 req->scmnd = NULL;
1944
e9684678 1945 spin_lock_irqsave(&target->lock, flags);
76c75b25 1946 list_add(&req->list, &target->free_reqs);
695b8349
BVA		 1947
1948err_unlock:
e9684678 1949 spin_unlock_irqrestore(&target->lock, flags);
76c75b25 1950
d1b4289e
BVA		 1951err:
1952 if (scmnd->result) {
1953 scmnd->scsi_done(scmnd);
1954 ret = 0;
1955 } else {
1956 ret = SCSI_MLQUEUE_HOST_BUSY;
1957 }
a95cadb9 1958
d1b4289e 1959 goto unlock_rport;
aef9ec39
RD		 1960}
1961
4d73f95f
BVA		 1962/*
1963 * Note: the resources allocated in this function are freed in
1964 * srp_free_target_ib().
1965 */
aef9ec39
RD		 1966static int srp_alloc_iu_bufs(struct srp_target_port *target)
1967{
1968 int i;
1969
4d73f95f
BVA		 1970 target->rx_ring = kzalloc(target->queue_size * sizeof(*target->rx_ring),
1971 GFP_KERNEL);
1972 if (!target->rx_ring)
1973 goto err_no_ring;
1974 target->tx_ring = kzalloc(target->queue_size * sizeof(*target->tx_ring),
1975 GFP_KERNEL);
1976 if (!target->tx_ring)
1977 goto err_no_ring;
1978
1979 for (i = 0; i < target->queue_size; ++i) {
aef9ec39
RD		 1980 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1981 target->max_ti_iu_len,
1982 GFP_KERNEL, DMA_FROM_DEVICE);
1983 if (!target->rx_ring[i])
1984 goto err;
1985 }
1986
4d73f95f 1987 for (i = 0; i < target->queue_size; ++i) {
aef9ec39 1988 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
49248644 1989 target->max_iu_len,
aef9ec39
RD		 1990 GFP_KERNEL, DMA_TO_DEVICE);
1991 if (!target->tx_ring[i])
1992 goto err;
dcb4cb85
BVA		 1993
1994 list_add(&target->tx_ring[i]->list, &target->free_tx);
aef9ec39
RD		 1995 }
1996
1997 return 0;
1998
1999err:
4d73f95f 2000 for (i = 0; i < target->queue_size; ++i) {
aef9ec39 2001 srp_free_iu(target->srp_host, target->rx_ring[i]);
aef9ec39 2002 srp_free_iu(target->srp_host, target->tx_ring[i]);
aef9ec39
RD		 2003 }
2004
4d73f95f
BVA		 2005
2006err_no_ring:
2007 kfree(target->tx_ring);
2008 target->tx_ring = NULL;
2009 kfree(target->rx_ring);
2010 target->rx_ring = NULL;
2011
aef9ec39
RD		 2012 return -ENOMEM;
2013}
2014
c9b03c1a
BVA		 2015static uint32_t srp_compute_rq_tmo(struct ib_qp_attr *qp_attr, int attr_mask)
2016{
2017 uint64_t T_tr_ns, max_compl_time_ms;
2018 uint32_t rq_tmo_jiffies;
2019
2020 /*
2021 * According to section 11.2.4.2 in the IBTA spec (Modify Queue Pair,
2022 * table 91), both the QP timeout and the retry count have to be set
2023 * for RC QP's during the RTR to RTS transition.
2024 */
2025 WARN_ON_ONCE((attr_mask & (IB_QP_TIMEOUT | IB_QP_RETRY_CNT)) !=
2026 (IB_QP_TIMEOUT | IB_QP_RETRY_CNT));
2027
2028 /*
2029 * Set target->rq_tmo_jiffies to one second more than the largest time
2030 * it can take before an error completion is generated. See also
2031 * C9-140..142 in the IBTA spec for more information about how to
2032 * convert the QP Local ACK Timeout value to nanoseconds.
2033 */
2034 T_tr_ns = 4096 * (1ULL << qp_attr->timeout);
2035 max_compl_time_ms = qp_attr->retry_cnt * 4 * T_tr_ns;
2036 do_div(max_compl_time_ms, NSEC_PER_MSEC);
2037 rq_tmo_jiffies = msecs_to_jiffies(max_compl_time_ms + 1000);
2038
2039 return rq_tmo_jiffies;
2040}
2041
961e0be8
DD		 2042static void srp_cm_rep_handler(struct ib_cm_id *cm_id,
2043 struct srp_login_rsp *lrsp,
2044 struct srp_target_port *target)
2045{
2046 struct ib_qp_attr *qp_attr = NULL;
2047 int attr_mask = 0;
2048 int ret;
2049 int i;
2050
2051 if (lrsp->opcode == SRP_LOGIN_RSP) {
2052 target->max_ti_iu_len = be32_to_cpu(lrsp->max_ti_iu_len);
2053 target->req_lim = be32_to_cpu(lrsp->req_lim_delta);
2054
2055 /*
2056 * Reserve credits for task management so we don't
2057 * bounce requests back to the SCSI mid-layer.
2058 */
2059 target->scsi_host->can_queue
2060 = min(target->req_lim - SRP_TSK_MGMT_SQ_SIZE,
2061 target->scsi_host->can_queue);
4d73f95f
BVA		 2062 target->scsi_host->cmd_per_lun
2063 = min_t(int, target->scsi_host->can_queue,
2064 target->scsi_host->cmd_per_lun);
961e0be8
DD		 2065 } else {
2066 shost_printk(KERN_WARNING, target->scsi_host,
2067 PFX "Unhandled RSP opcode %#x\n", lrsp->opcode);
2068 ret = -ECONNRESET;
2069 goto error;
2070 }
2071
4d73f95f 2072 if (!target->rx_ring) {
961e0be8
DD		 2073 ret = srp_alloc_iu_bufs(target);
2074 if (ret)
2075 goto error;
2076 }
2077
2078 ret = -ENOMEM;
2079 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
2080 if (!qp_attr)
2081 goto error;
2082
2083 qp_attr->qp_state = IB_QPS_RTR;
2084 ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
2085 if (ret)
2086 goto error_free;
2087
2088 ret = ib_modify_qp(target->qp, qp_attr, attr_mask);
2089 if (ret)
2090 goto error_free;
2091
4d73f95f 2092 for (i = 0; i < target->queue_size; i++) {
961e0be8
DD		 2093 struct srp_iu *iu = target->rx_ring[i];
2094 ret = srp_post_recv(target, iu);
2095 if (ret)
2096 goto error_free;
2097 }
2098
2099 qp_attr->qp_state = IB_QPS_RTS;
2100 ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
2101 if (ret)
2102 goto error_free;
2103
c9b03c1a
BVA		 2104 target->rq_tmo_jiffies = srp_compute_rq_tmo(qp_attr, attr_mask);
2105
961e0be8
DD		 2106 ret = ib_modify_qp(target->qp, qp_attr, attr_mask);
2107 if (ret)
2108 goto error_free;
2109
2110 ret = ib_send_cm_rtu(cm_id, NULL, 0);
2111
2112error_free:
2113 kfree(qp_attr);
2114
2115error:
2116 target->status = ret;
2117}
2118
aef9ec39
RD		 2119static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
2120 struct ib_cm_event *event,
2121 struct srp_target_port *target)
2122{
7aa54bd7 2123 struct Scsi_Host *shost = target->scsi_host;
aef9ec39
RD		 2124 struct ib_class_port_info *cpi;
2125 int opcode;
2126
2127 switch (event->param.rej_rcvd.reason) {
2128 case IB_CM_REJ_PORT_CM_REDIRECT:
2129 cpi = event->param.rej_rcvd.ari;
2130 target->path.dlid = cpi->redirect_lid;
2131 target->path.pkey = cpi->redirect_pkey;
2132 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
2133 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
2134
2135 target->status = target->path.dlid ?
2136 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
2137 break;
2138
2139 case IB_CM_REJ_PORT_REDIRECT:
5d7cbfd6 2140 if (srp_target_is_topspin(target)) {
aef9ec39
RD		 2141 /*
2142 * Topspin/Cisco SRP gateways incorrectly send
2143 * reject reason code 25 when they mean 24
2144 * (port redirect).
2145 */
2146 memcpy(target->path.dgid.raw,
2147 event->param.rej_rcvd.ari, 16);
2148
7aa54bd7
DD		 2149 shost_printk(KERN_DEBUG, shost,
2150 PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
2151 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
2152 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
aef9ec39
RD		 2153
2154 target->status = SRP_PORT_REDIRECT;
2155 } else {
7aa54bd7
DD		 2156 shost_printk(KERN_WARNING, shost,
2157 " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
aef9ec39
RD		 2158 target->status = -ECONNRESET;
2159 }
2160 break;
2161
2162 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
7aa54bd7
DD		 2163 shost_printk(KERN_WARNING, shost,
2164 " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
aef9ec39
RD		 2165 target->status = -ECONNRESET;
2166 break;
2167
2168 case IB_CM_REJ_CONSUMER_DEFINED:
2169 opcode = *(u8 *) event->private_data;
2170 if (opcode == SRP_LOGIN_REJ) {
2171 struct srp_login_rej *rej = event->private_data;
2172 u32 reason = be32_to_cpu(rej->reason);
2173
2174 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
7aa54bd7
DD		 2175 shost_printk(KERN_WARNING, shost,
2176 PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
aef9ec39 2177 else
e7ffde01
BVA		 2178 shost_printk(KERN_WARNING, shost, PFX
2179 "SRP LOGIN from %pI6 to %pI6 REJECTED, reason 0x%08x\n",
2180 target->path.sgid.raw,
2181 target->orig_dgid, reason);
aef9ec39 2182 } else
7aa54bd7
DD		 2183 shost_printk(KERN_WARNING, shost,
2184 " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
2185 " opcode 0x%02x\n", opcode);
aef9ec39
RD		 2186 target->status = -ECONNRESET;
2187 break;
2188
9fe4bcf4
DD		 2189 case IB_CM_REJ_STALE_CONN:
2190 shost_printk(KERN_WARNING, shost, " REJ reason: stale connection\n");
2191 target->status = SRP_STALE_CONN;
2192 break;
2193
aef9ec39 2194 default:
7aa54bd7
DD		 2195 shost_printk(KERN_WARNING, shost, " REJ reason 0x%x\n",
2196 event->param.rej_rcvd.reason);
aef9ec39
RD		 2197 target->status = -ECONNRESET;
2198 }
2199}
2200
2201static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
2202{
2203 struct srp_target_port *target = cm_id->context;
aef9ec39 2204 int comp = 0;
aef9ec39
RD		 2205
2206 switch (event->event) {
2207 case IB_CM_REQ_ERROR:
7aa54bd7
DD		 2208 shost_printk(KERN_DEBUG, target->scsi_host,
2209 PFX "Sending CM REQ failed\n");
aef9ec39
RD		 2210 comp = 1;
2211 target->status = -ECONNRESET;
2212 break;
2213
2214 case IB_CM_REP_RECEIVED:
2215 comp = 1;
961e0be8 2216 srp_cm_rep_handler(cm_id, event->private_data, target);
aef9ec39
RD		 2217 break;
2218
2219 case IB_CM_REJ_RECEIVED:
7aa54bd7 2220 shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
aef9ec39
RD		 2221 comp = 1;
2222
2223 srp_cm_rej_handler(cm_id, event, target);
2224 break;
2225
b7ac4ab4 2226 case IB_CM_DREQ_RECEIVED:
7aa54bd7
DD		 2227 shost_printk(KERN_WARNING, target->scsi_host,
2228 PFX "DREQ received - connection closed\n");
294c875a 2229 srp_change_conn_state(target, false);
b7ac4ab4 2230 if (ib_send_cm_drep(cm_id, NULL, 0))
7aa54bd7
DD		 2231 shost_printk(KERN_ERR, target->scsi_host,
2232 PFX "Sending CM DREP failed\n");
c1120f89 2233 queue_work(system_long_wq, &target->tl_err_work);
aef9ec39
RD		 2234 break;
2235
2236 case IB_CM_TIMEWAIT_EXIT:
7aa54bd7
DD		 2237 shost_printk(KERN_ERR, target->scsi_host,
2238 PFX "connection closed\n");
ac72d766 2239 comp = 1;
aef9ec39 2240
aef9ec39
RD		 2241 target->status = 0;
2242 break;
2243
b7ac4ab4
IR		 2244 case IB_CM_MRA_RECEIVED:
2245 case IB_CM_DREQ_ERROR:
2246 case IB_CM_DREP_RECEIVED:
2247 break;
2248
aef9ec39 2249 default:
7aa54bd7
DD		 2250 shost_printk(KERN_WARNING, target->scsi_host,
2251 PFX "Unhandled CM event %d\n", event->event);
aef9ec39
RD		 2252 break;
2253 }
2254
2255 if (comp)
2256 complete(&target->done);
2257
aef9ec39
RD		 2258 return 0;
2259}
2260
71444b97
JW		 2261/**
2262 * srp_change_queue_type - changing device queue tag type
2263 * @sdev: scsi device struct
2264 * @tag_type: requested tag type
2265 *
2266 * Returns queue tag type.
2267 */
2268static int
2269srp_change_queue_type(struct scsi_device *sdev, int tag_type)
2270{
2271 if (sdev->tagged_supported) {
2272 scsi_set_tag_type(sdev, tag_type);
2273 if (tag_type)
2274 scsi_activate_tcq(sdev, sdev->queue_depth);
2275 else
2276 scsi_deactivate_tcq(sdev, sdev->queue_depth);
2277 } else
2278 tag_type = 0;
2279
2280 return tag_type;
2281}
2282
2283/**
2284 * srp_change_queue_depth - setting device queue depth
2285 * @sdev: scsi device struct
2286 * @qdepth: requested queue depth
2287 * @reason: SCSI_QDEPTH_DEFAULT/SCSI_QDEPTH_QFULL/SCSI_QDEPTH_RAMP_UP
2288 * (see include/scsi/scsi_host.h for definition)
2289 *
2290 * Returns queue depth.
2291 */
2292static int
2293srp_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason)
2294{
2295 struct Scsi_Host *shost = sdev->host;
2296 int max_depth;
2297 if (reason == SCSI_QDEPTH_DEFAULT || reason == SCSI_QDEPTH_RAMP_UP) {
2298 max_depth = shost->can_queue;
2299 if (!sdev->tagged_supported)
2300 max_depth = 1;
2301 if (qdepth > max_depth)
2302 qdepth = max_depth;
2303 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
2304 } else if (reason == SCSI_QDEPTH_QFULL)
2305 scsi_track_queue_full(sdev, qdepth);
2306 else
2307 return -EOPNOTSUPP;
2308
2309 return sdev->queue_depth;
2310}
2311
d945e1df 2312static int srp_send_tsk_mgmt(struct srp_target_port *target,
f8b6e31e 2313 u64 req_tag, unsigned int lun, u8 func)
aef9ec39 2314{
a95cadb9 2315 struct srp_rport *rport = target->rport;
19081f31 2316 struct ib_device *dev = target->srp_host->srp_dev->dev;
aef9ec39
RD		 2317 struct srp_iu *iu;
2318 struct srp_tsk_mgmt *tsk_mgmt;
aef9ec39 2319
3780d1f0
BVA		 2320 if (!target->connected || target->qp_in_error)
2321 return -1;
2322
f8b6e31e 2323 init_completion(&target->tsk_mgmt_done);
aef9ec39 2324
a95cadb9
BVA		 2325 /*
2326 * Lock the rport mutex to avoid that srp_create_target_ib() is
2327 * invoked while a task management function is being sent.
2328 */
2329 mutex_lock(&rport->mutex);
e9684678 2330 spin_lock_irq(&target->lock);
bb12588a 2331 iu = __srp_get_tx_iu(target, SRP_IU_TSK_MGMT);
e9684678 2332 spin_unlock_irq(&target->lock);
76c75b25 2333
a95cadb9
BVA		 2334 if (!iu) {
2335 mutex_unlock(&rport->mutex);
2336
76c75b25 2337 return -1;
a95cadb9 2338 }
aef9ec39 2339
19081f31
DD		 2340 ib_dma_sync_single_for_cpu(dev, iu->dma, sizeof *tsk_mgmt,
2341 DMA_TO_DEVICE);
aef9ec39
RD		 2342 tsk_mgmt = iu->buf;
2343 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
2344
2345 tsk_mgmt->opcode = SRP_TSK_MGMT;
f8b6e31e
DD		 2346 tsk_mgmt->lun = cpu_to_be64((u64) lun << 48);
2347 tsk_mgmt->tag = req_tag | SRP_TAG_TSK_MGMT;
aef9ec39 2348 tsk_mgmt->tsk_mgmt_func = func;
f8b6e31e 2349 tsk_mgmt->task_tag = req_tag;
aef9ec39 2350
19081f31
DD		 2351 ib_dma_sync_single_for_device(dev, iu->dma, sizeof *tsk_mgmt,
2352 DMA_TO_DEVICE);
76c75b25
BVA		 2353 if (srp_post_send(target, iu, sizeof *tsk_mgmt)) {
2354 srp_put_tx_iu(target, iu, SRP_IU_TSK_MGMT);
a95cadb9
BVA		 2355 mutex_unlock(&rport->mutex);
2356
76c75b25
BVA		 2357 return -1;
2358 }
a95cadb9 2359 mutex_unlock(&rport->mutex);
d945e1df 2360
f8b6e31e 2361 if (!wait_for_completion_timeout(&target->tsk_mgmt_done,
aef9ec39 2362 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
d945e1df 2363 return -1;
aef9ec39 2364
d945e1df 2365 return 0;
d945e1df
RD		 2366}
2367
aef9ec39
RD		 2368static int srp_abort(struct scsi_cmnd *scmnd)
2369{
d945e1df 2370 struct srp_target_port *target = host_to_target(scmnd->device->host);
f8b6e31e 2371 struct srp_request *req = (struct srp_request *) scmnd->host_scribble;
086f44f5 2372 int ret;
d945e1df 2373
7aa54bd7 2374 shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
aef9ec39 2375
b3fe628d 2376 if (!req || !srp_claim_req(target, req, NULL, scmnd))
99b6697a 2377 return SUCCESS;
086f44f5 2378 if (srp_send_tsk_mgmt(target, req->index, scmnd->device->lun,
80d5e8a2 2379 SRP_TSK_ABORT_TASK) == 0)
086f44f5 2380 ret = SUCCESS;
ed9b2264 2381 else if (target->rport->state == SRP_RPORT_LOST)
99e1c139 2382 ret = FAST_IO_FAIL;
086f44f5
BVA		 2383 else
2384 ret = FAILED;
22032991
BVA		 2385 srp_free_req(target, req, scmnd, 0);
2386 scmnd->result = DID_ABORT << 16;
d8536670 2387 scmnd->scsi_done(scmnd);
d945e1df 2388
086f44f5 2389 return ret;
aef9ec39
RD		 2390}
2391
2392static int srp_reset_device(struct scsi_cmnd *scmnd)
2393{
d945e1df 2394 struct srp_target_port *target = host_to_target(scmnd->device->host);
536ae14e 2395 int i;
d945e1df 2396
7aa54bd7 2397 shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
aef9ec39 2398
f8b6e31e
DD		 2399 if (srp_send_tsk_mgmt(target, SRP_TAG_NO_REQ, scmnd->device->lun,
2400 SRP_TSK_LUN_RESET))
d945e1df 2401 return FAILED;
f8b6e31e 2402 if (target->tsk_mgmt_status)
d945e1df
RD		 2403 return FAILED;
2404
4d73f95f 2405 for (i = 0; i < target->req_ring_size; ++i) {
536ae14e 2406 struct srp_request *req = &target->req_ring[i];
b3fe628d 2407 srp_finish_req(target, req, scmnd->device, DID_RESET << 16);
536ae14e 2408 }
d945e1df 2409
d945e1df 2410 return SUCCESS;
aef9ec39
RD		 2411}
2412
2413static int srp_reset_host(struct scsi_cmnd *scmnd)
2414{
2415 struct srp_target_port *target = host_to_target(scmnd->device->host);
aef9ec39 2416
7aa54bd7 2417 shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
aef9ec39 2418
ed9b2264 2419 return srp_reconnect_rport(target->rport) == 0 ? SUCCESS : FAILED;
aef9ec39
RD		 2420}
2421
c9b03c1a
BVA		 2422static int srp_slave_configure(struct scsi_device *sdev)
2423{
2424 struct Scsi_Host *shost = sdev->host;
2425 struct srp_target_port *target = host_to_target(shost);
2426 struct request_queue *q = sdev->request_queue;
2427 unsigned long timeout;
2428
2429 if (sdev->type == TYPE_DISK) {
2430 timeout = max_t(unsigned, 30 * HZ, target->rq_tmo_jiffies);
2431 blk_queue_rq_timeout(q, timeout);
2432 }
2433
2434 return 0;
2435}
2436
ee959b00
TJ		 2437static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr,
2438 char *buf)
6ecb0c84 2439{
ee959b00 2440 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 2441
6ecb0c84
RD		 2442 return sprintf(buf, "0x%016llx\n",
2443 (unsigned long long) be64_to_cpu(target->id_ext));
2444}
2445
ee959b00
TJ		 2446static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr,
2447 char *buf)
6ecb0c84 2448{
ee959b00 2449 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 2450
6ecb0c84
RD		 2451 return sprintf(buf, "0x%016llx\n",
2452 (unsigned long long) be64_to_cpu(target->ioc_guid));
2453}
2454
ee959b00
TJ		 2455static ssize_t show_service_id(struct device *dev,
2456 struct device_attribute *attr, char *buf)
6ecb0c84 2457{
ee959b00 2458 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 2459
6ecb0c84
RD		 2460 return sprintf(buf, "0x%016llx\n",
2461 (unsigned long long) be64_to_cpu(target->service_id));
2462}
2463
ee959b00
TJ		 2464static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
2465 char *buf)
6ecb0c84 2466{
ee959b00 2467 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 2468
6ecb0c84
RD		 2469 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
2470}
2471
848b3082
BVA		 2472static ssize_t show_sgid(struct device *dev, struct device_attribute *attr,
2473 char *buf)
2474{
2475 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2476
2477 return sprintf(buf, "%pI6\n", target->path.sgid.raw);
2478}
2479
ee959b00
TJ		 2480static ssize_t show_dgid(struct device *dev, struct device_attribute *attr,
2481 char *buf)
6ecb0c84 2482{
ee959b00 2483 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 2484
5b095d98 2485 return sprintf(buf, "%pI6\n", target->path.dgid.raw);
6ecb0c84
RD		 2486}
2487
ee959b00
TJ		 2488static ssize_t show_orig_dgid(struct device *dev,
2489 struct device_attribute *attr, char *buf)
3633b3d0 2490{
ee959b00 2491 struct srp_target_port *target = host_to_target(class_to_shost(dev));
3633b3d0 2492
5b095d98 2493 return sprintf(buf, "%pI6\n", target->orig_dgid);
3633b3d0
IR		 2494}
2495
89de7486
BVA		 2496static ssize_t show_req_lim(struct device *dev,
2497 struct device_attribute *attr, char *buf)
2498{
2499 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2500
89de7486
BVA		 2501 return sprintf(buf, "%d\n", target->req_lim);
2502}
2503
ee959b00
TJ		 2504static ssize_t show_zero_req_lim(struct device *dev,
2505 struct device_attribute *attr, char *buf)
6bfa24fa 2506{
ee959b00 2507 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6bfa24fa 2508
6bfa24fa
RD		 2509 return sprintf(buf, "%d\n", target->zero_req_lim);
2510}
2511
ee959b00
TJ		 2512static ssize_t show_local_ib_port(struct device *dev,
2513 struct device_attribute *attr, char *buf)
ded7f1a1 2514{
ee959b00 2515 struct srp_target_port *target = host_to_target(class_to_shost(dev));
ded7f1a1
IR		 2516
2517 return sprintf(buf, "%d\n", target->srp_host->port);
2518}
2519
ee959b00
TJ		 2520static ssize_t show_local_ib_device(struct device *dev,
2521 struct device_attribute *attr, char *buf)
ded7f1a1 2522{
ee959b00 2523 struct srp_target_port *target = host_to_target(class_to_shost(dev));
ded7f1a1 2524
05321937 2525 return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name);
ded7f1a1
IR		 2526}
2527
4b5e5f41
BVA		 2528static ssize_t show_comp_vector(struct device *dev,
2529 struct device_attribute *attr, char *buf)
2530{
2531 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2532
2533 return sprintf(buf, "%d\n", target->comp_vector);
2534}
2535
7bb312e4
VP		 2536static ssize_t show_tl_retry_count(struct device *dev,
2537 struct device_attribute *attr, char *buf)
2538{
2539 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2540
2541 return sprintf(buf, "%d\n", target->tl_retry_count);
2542}
2543
49248644
DD		 2544static ssize_t show_cmd_sg_entries(struct device *dev,
2545 struct device_attribute *attr, char *buf)
2546{
2547 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2548
2549 return sprintf(buf, "%u\n", target->cmd_sg_cnt);
2550}
2551
c07d424d
DD		 2552static ssize_t show_allow_ext_sg(struct device *dev,
2553 struct device_attribute *attr, char *buf)
2554{
2555 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2556
2557 return sprintf(buf, "%s\n", target->allow_ext_sg ? "true" : "false");
2558}
2559
ee959b00
TJ		 2560static DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
2561static DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
2562static DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
2563static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
848b3082 2564static DEVICE_ATTR(sgid, S_IRUGO, show_sgid, NULL);
ee959b00
TJ		 2565static DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
2566static DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL);
89de7486 2567static DEVICE_ATTR(req_lim, S_IRUGO, show_req_lim, NULL);
ee959b00
TJ		 2568static DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL);
2569static DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL);
2570static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
4b5e5f41 2571static DEVICE_ATTR(comp_vector, S_IRUGO, show_comp_vector, NULL);
7bb312e4 2572static DEVICE_ATTR(tl_retry_count, S_IRUGO, show_tl_retry_count, NULL);
49248644 2573static DEVICE_ATTR(cmd_sg_entries, S_IRUGO, show_cmd_sg_entries, NULL);
c07d424d 2574static DEVICE_ATTR(allow_ext_sg, S_IRUGO, show_allow_ext_sg, NULL);
ee959b00
TJ		 2575
2576static struct device_attribute *srp_host_attrs[] = {
2577 &dev_attr_id_ext,
2578 &dev_attr_ioc_guid,
2579 &dev_attr_service_id,
2580 &dev_attr_pkey,
848b3082 2581 &dev_attr_sgid,
ee959b00
TJ		 2582 &dev_attr_dgid,
2583 &dev_attr_orig_dgid,
89de7486 2584 &dev_attr_req_lim,
ee959b00
TJ		 2585 &dev_attr_zero_req_lim,
2586 &dev_attr_local_ib_port,
2587 &dev_attr_local_ib_device,
4b5e5f41 2588 &dev_attr_comp_vector,
7bb312e4 2589 &dev_attr_tl_retry_count,
49248644 2590 &dev_attr_cmd_sg_entries,
c07d424d 2591 &dev_attr_allow_ext_sg,
6ecb0c84
RD		 2592 NULL
2593};
2594
aef9ec39
RD		 2595static struct scsi_host_template srp_template = {
2596 .module = THIS_MODULE,
b7f008fd
RD		 2597 .name = "InfiniBand SRP initiator",
2598 .proc_name = DRV_NAME,
c9b03c1a 2599 .slave_configure = srp_slave_configure,
aef9ec39
RD		 2600 .info = srp_target_info,
2601 .queuecommand = srp_queuecommand,
71444b97
JW		 2602 .change_queue_depth = srp_change_queue_depth,
2603 .change_queue_type = srp_change_queue_type,
aef9ec39
RD		 2604 .eh_abort_handler = srp_abort,
2605 .eh_device_reset_handler = srp_reset_device,
2606 .eh_host_reset_handler = srp_reset_host,
2742c1da 2607 .skip_settle_delay = true,
49248644 2608 .sg_tablesize = SRP_DEF_SG_TABLESIZE,
4d73f95f 2609 .can_queue = SRP_DEFAULT_CMD_SQ_SIZE,
aef9ec39 2610 .this_id = -1,
4d73f95f 2611 .cmd_per_lun = SRP_DEFAULT_CMD_SQ_SIZE,
6ecb0c84
RD		 2612 .use_clustering = ENABLE_CLUSTERING,
2613 .shost_attrs = srp_host_attrs
aef9ec39
RD		 2614};
2615
2616static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
2617{
3236822b
FT		 2618 struct srp_rport_identifiers ids;
2619 struct srp_rport *rport;
2620
aef9ec39
RD		 2621 sprintf(target->target_name, "SRP.T10:%016llX",
2622 (unsigned long long) be64_to_cpu(target->id_ext));
2623
05321937 2624 if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device))
aef9ec39
RD		 2625 return -ENODEV;
2626
3236822b
FT		 2627 memcpy(ids.port_id, &target->id_ext, 8);
2628 memcpy(ids.port_id + 8, &target->ioc_guid, 8);
aebd5e47 2629 ids.roles = SRP_RPORT_ROLE_TARGET;
3236822b
FT		 2630 rport = srp_rport_add(target->scsi_host, &ids);
2631 if (IS_ERR(rport)) {
2632 scsi_remove_host(target->scsi_host);
2633 return PTR_ERR(rport);
2634 }
2635
dc1bdbd9 2636 rport->lld_data = target;
9dd69a60 2637 target->rport = rport;
dc1bdbd9 2638
b3589fd4 2639 spin_lock(&host->target_lock);
aef9ec39 2640 list_add_tail(&target->list, &host->target_list);
b3589fd4 2641 spin_unlock(&host->target_lock);
aef9ec39
RD		 2642
2643 target->state = SRP_TARGET_LIVE;
2644
aef9ec39 2645 scsi_scan_target(&target->scsi_host->shost_gendev,
1962a4a1 2646 0, target->scsi_id, SCAN_WILD_CARD, 0);
aef9ec39
RD		 2647
2648 return 0;
2649}
2650
ee959b00 2651static void srp_release_dev(struct device *dev)
aef9ec39
RD		 2652{
2653 struct srp_host *host =
ee959b00 2654 container_of(dev, struct srp_host, dev);
aef9ec39
RD		 2655
2656 complete(&host->released);
2657}
2658
2659static struct class srp_class = {
2660 .name = "infiniband_srp",
ee959b00 2661 .dev_release = srp_release_dev
aef9ec39
RD		 2662};
2663
96fc248a
BVA		 2664/**
2665 * srp_conn_unique() - check whether the connection to a target is unique
af24663b
BVA		 2666 * @host: SRP host.
2667 * @target: SRP target port.
96fc248a
BVA		 2668 */
2669static bool srp_conn_unique(struct srp_host *host,
2670 struct srp_target_port *target)
2671{
2672 struct srp_target_port *t;
2673 bool ret = false;
2674
2675 if (target->state == SRP_TARGET_REMOVED)
2676 goto out;
2677
2678 ret = true;
2679
2680 spin_lock(&host->target_lock);
2681 list_for_each_entry(t, &host->target_list, list) {
2682 if (t != target &&
2683 target->id_ext == t->id_ext &&
2684 target->ioc_guid == t->ioc_guid &&
2685 target->initiator_ext == t->initiator_ext) {
2686 ret = false;
2687 break;
2688 }
2689 }
2690 spin_unlock(&host->target_lock);
2691
2692out:
2693 return ret;
2694}
2695
aef9ec39
RD		 2696/*
2697 * Target ports are added by writing
2698 *
2699 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
2700 * pkey=<P_Key>,service_id=<service ID>
2701 *
2702 * to the add_target sysfs attribute.
2703 */
2704enum {
2705 SRP_OPT_ERR = 0,
2706 SRP_OPT_ID_EXT = 1 << 0,
2707 SRP_OPT_IOC_GUID = 1 << 1,
2708 SRP_OPT_DGID = 1 << 2,
2709 SRP_OPT_PKEY = 1 << 3,
2710 SRP_OPT_SERVICE_ID = 1 << 4,
2711 SRP_OPT_MAX_SECT = 1 << 5,
52fb2b50 2712 SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
0c0450db 2713 SRP_OPT_IO_CLASS = 1 << 7,
01cb9bcb 2714 SRP_OPT_INITIATOR_EXT = 1 << 8,
49248644 2715 SRP_OPT_CMD_SG_ENTRIES = 1 << 9,
c07d424d
DD		 2716 SRP_OPT_ALLOW_EXT_SG = 1 << 10,
2717 SRP_OPT_SG_TABLESIZE = 1 << 11,
4b5e5f41 2718 SRP_OPT_COMP_VECTOR = 1 << 12,
7bb312e4 2719 SRP_OPT_TL_RETRY_COUNT = 1 << 13,
4d73f95f 2720 SRP_OPT_QUEUE_SIZE = 1 << 14,
aef9ec39
RD		 2721 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
2722 SRP_OPT_IOC_GUID |
2723 SRP_OPT_DGID |
2724 SRP_OPT_PKEY |
2725 SRP_OPT_SERVICE_ID),
2726};
2727
a447c093 2728static const match_table_t srp_opt_tokens = {
52fb2b50
VP		 2729 { SRP_OPT_ID_EXT, "id_ext=%s" },
2730 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
2731 { SRP_OPT_DGID, "dgid=%s" },
2732 { SRP_OPT_PKEY, "pkey=%x" },
2733 { SRP_OPT_SERVICE_ID, "service_id=%s" },
2734 { SRP_OPT_MAX_SECT, "max_sect=%d" },
2735 { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" },
0c0450db 2736 { SRP_OPT_IO_CLASS, "io_class=%x" },
01cb9bcb 2737 { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" },
49248644 2738 { SRP_OPT_CMD_SG_ENTRIES, "cmd_sg_entries=%u" },
c07d424d
DD		 2739 { SRP_OPT_ALLOW_EXT_SG, "allow_ext_sg=%u" },
2740 { SRP_OPT_SG_TABLESIZE, "sg_tablesize=%u" },
4b5e5f41 2741 { SRP_OPT_COMP_VECTOR, "comp_vector=%u" },
7bb312e4 2742 { SRP_OPT_TL_RETRY_COUNT, "tl_retry_count=%u" },
4d73f95f 2743 { SRP_OPT_QUEUE_SIZE, "queue_size=%d" },
52fb2b50 2744 { SRP_OPT_ERR, NULL }
aef9ec39
RD		 2745};
2746
2747static int srp_parse_options(const char *buf, struct srp_target_port *target)
2748{
2749 char *options, *sep_opt;
2750 char *p;
2751 char dgid[3];
2752 substring_t args[MAX_OPT_ARGS];
2753 int opt_mask = 0;
2754 int token;
2755 int ret = -EINVAL;
2756 int i;
2757
2758 options = kstrdup(buf, GFP_KERNEL);
2759 if (!options)
2760 return -ENOMEM;
2761
2762 sep_opt = options;
2763 while ((p = strsep(&sep_opt, ",")) != NULL) {
2764 if (!*p)
2765 continue;
2766
2767 token = match_token(p, srp_opt_tokens, args);
2768 opt_mask |= token;
2769
2770 switch (token) {
2771 case SRP_OPT_ID_EXT:
2772 p = match_strdup(args);
a20f3a6d
IR		 2773 if (!p) {
2774 ret = -ENOMEM;
2775 goto out;
2776 }
aef9ec39
RD		 2777 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
2778 kfree(p);
2779 break;
2780
2781 case SRP_OPT_IOC_GUID:
2782 p = match_strdup(args);
a20f3a6d
IR		 2783 if (!p) {
2784 ret = -ENOMEM;
2785 goto out;
2786 }
aef9ec39
RD		 2787 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
2788 kfree(p);
2789 break;
2790
2791 case SRP_OPT_DGID:
2792 p = match_strdup(args);
a20f3a6d
IR		 2793 if (!p) {
2794 ret = -ENOMEM;
2795 goto out;
2796 }
aef9ec39 2797 if (strlen(p) != 32) {
e0bda7d8 2798 pr_warn("bad dest GID parameter '%s'\n", p);
ce1823f0 2799 kfree(p);
aef9ec39
RD		 2800 goto out;
2801 }
2802
2803 for (i = 0; i < 16; ++i) {
2804 strlcpy(dgid, p + i * 2, 3);
2805 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
2806 }
bf17c1c7 2807 kfree(p);
3633b3d0 2808 memcpy(target->orig_dgid, target->path.dgid.raw, 16);
aef9ec39
RD		 2809 break;
2810
2811 case SRP_OPT_PKEY:
2812 if (match_hex(args, &token)) {
e0bda7d8 2813 pr_warn("bad P_Key parameter '%s'\n", p);
aef9ec39
RD		 2814 goto out;
2815 }
2816 target->path.pkey = cpu_to_be16(token);
2817 break;
2818
2819 case SRP_OPT_SERVICE_ID:
2820 p = match_strdup(args);
a20f3a6d
IR		 2821 if (!p) {
2822 ret = -ENOMEM;
2823 goto out;
2824 }
aef9ec39 2825 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
247e020e 2826 target->path.service_id = target->service_id;
aef9ec39
RD		 2827 kfree(p);
2828 break;
2829
2830 case SRP_OPT_MAX_SECT:
2831 if (match_int(args, &token)) {
e0bda7d8 2832 pr_warn("bad max sect parameter '%s'\n", p);
aef9ec39
RD		 2833 goto out;
2834 }
2835 target->scsi_host->max_sectors = token;
2836 break;
2837
4d73f95f
BVA		 2838 case SRP_OPT_QUEUE_SIZE:
2839 if (match_int(args, &token) || token < 1) {
2840 pr_warn("bad queue_size parameter '%s'\n", p);
2841 goto out;
2842 }
2843 target->scsi_host->can_queue = token;
2844 target->queue_size = token + SRP_RSP_SQ_SIZE +
2845 SRP_TSK_MGMT_SQ_SIZE;
2846 if (!(opt_mask & SRP_OPT_MAX_CMD_PER_LUN))
2847 target->scsi_host->cmd_per_lun = token;
2848 break;
2849
52fb2b50 2850 case SRP_OPT_MAX_CMD_PER_LUN:
4d73f95f 2851 if (match_int(args, &token) || token < 1) {
e0bda7d8
BVA		 2852 pr_warn("bad max cmd_per_lun parameter '%s'\n",
2853 p);
52fb2b50
VP		 2854 goto out;
2855 }
4d73f95f 2856 target->scsi_host->cmd_per_lun = token;
52fb2b50
VP		 2857 break;
2858
0c0450db
R		 2859 case SRP_OPT_IO_CLASS:
2860 if (match_hex(args, &token)) {
e0bda7d8 2861 pr_warn("bad IO class parameter '%s'\n", p);
0c0450db
R		 2862 goto out;
2863 }
2864 if (token != SRP_REV10_IB_IO_CLASS &&
2865 token != SRP_REV16A_IB_IO_CLASS) {
e0bda7d8
BVA		 2866 pr_warn("unknown IO class parameter value %x specified (use %x or %x).\n",
2867 token, SRP_REV10_IB_IO_CLASS,
2868 SRP_REV16A_IB_IO_CLASS);
0c0450db
R		 2869 goto out;
2870 }
2871 target->io_class = token;
2872 break;
2873
01cb9bcb
IR		 2874 case SRP_OPT_INITIATOR_EXT:
2875 p = match_strdup(args);
a20f3a6d
IR		 2876 if (!p) {
2877 ret = -ENOMEM;
2878 goto out;
2879 }
01cb9bcb
IR		 2880 target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
2881 kfree(p);
2882 break;
2883
49248644
DD		 2884 case SRP_OPT_CMD_SG_ENTRIES:
2885 if (match_int(args, &token) || token < 1 || token > 255) {
e0bda7d8
BVA		 2886 pr_warn("bad max cmd_sg_entries parameter '%s'\n",
2887 p);
49248644
DD		 2888 goto out;
2889 }
2890 target->cmd_sg_cnt = token;
2891 break;
2892
c07d424d
DD		 2893 case SRP_OPT_ALLOW_EXT_SG:
2894 if (match_int(args, &token)) {
e0bda7d8 2895 pr_warn("bad allow_ext_sg parameter '%s'\n", p);
c07d424d
DD		 2896 goto out;
2897 }
2898 target->allow_ext_sg = !!token;
2899 break;
2900
2901 case SRP_OPT_SG_TABLESIZE:
2902 if (match_int(args, &token) || token < 1 ||
2903 token > SCSI_MAX_SG_CHAIN_SEGMENTS) {
e0bda7d8
BVA		 2904 pr_warn("bad max sg_tablesize parameter '%s'\n",
2905 p);
c07d424d
DD		 2906 goto out;
2907 }
2908 target->sg_tablesize = token;
2909 break;
2910
4b5e5f41
BVA		 2911 case SRP_OPT_COMP_VECTOR:
2912 if (match_int(args, &token) || token < 0) {
2913 pr_warn("bad comp_vector parameter '%s'\n", p);
2914 goto out;
2915 }
2916 target->comp_vector = token;
2917 break;
2918
7bb312e4
VP		 2919 case SRP_OPT_TL_RETRY_COUNT:
2920 if (match_int(args, &token) || token < 2 || token > 7) {
2921 pr_warn("bad tl_retry_count parameter '%s' (must be a number between 2 and 7)\n",
2922 p);
2923 goto out;
2924 }
2925 target->tl_retry_count = token;
2926 break;
2927
aef9ec39 2928 default:
e0bda7d8
BVA		 2929 pr_warn("unknown parameter or missing value '%s' in target creation request\n",
2930 p);
aef9ec39
RD		 2931 goto out;
2932 }
2933 }
2934
2935 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
2936 ret = 0;
2937 else
2938 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
2939 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
2940 !(srp_opt_tokens[i].token & opt_mask))
e0bda7d8
BVA		 2941 pr_warn("target creation request is missing parameter '%s'\n",
2942 srp_opt_tokens[i].pattern);
aef9ec39 2943
4d73f95f
BVA		 2944 if (target->scsi_host->cmd_per_lun > target->scsi_host->can_queue
2945 && (opt_mask & SRP_OPT_MAX_CMD_PER_LUN))
2946 pr_warn("cmd_per_lun = %d > queue_size = %d\n",
2947 target->scsi_host->cmd_per_lun,
2948 target->scsi_host->can_queue);
2949
aef9ec39
RD		 2950out:
2951 kfree(options);
2952 return ret;
2953}
2954
ee959b00
TJ		 2955static ssize_t srp_create_target(struct device *dev,
2956 struct device_attribute *attr,
aef9ec39
RD		 2957 const char *buf, size_t count)
2958{
2959 struct srp_host *host =
ee959b00 2960 container_of(dev, struct srp_host, dev);
aef9ec39
RD		 2961 struct Scsi_Host *target_host;
2962 struct srp_target_port *target;
d1b4289e
BVA		 2963 struct srp_device *srp_dev = host->srp_dev;
2964 struct ib_device *ibdev = srp_dev->dev;
b81d00bd 2965 int ret;
aef9ec39
RD		 2966
2967 target_host = scsi_host_alloc(&srp_template,
2968 sizeof (struct srp_target_port));
2969 if (!target_host)
2970 return -ENOMEM;
2971
49248644 2972 target_host->transportt = ib_srp_transport_template;
fd1b6c4a
BVA		 2973 target_host->max_channel = 0;
2974 target_host->max_id = 1;
3c8edf0e
AR		 2975 target_host->max_lun = SRP_MAX_LUN;
2976 target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
5f068992 2977
aef9ec39 2978 target = host_to_target(target_host);
aef9ec39 2979
49248644
DD		 2980 target->io_class = SRP_REV16A_IB_IO_CLASS;
2981 target->scsi_host = target_host;
2982 target->srp_host = host;
2983 target->lkey = host->srp_dev->mr->lkey;
2984 target->rkey = host->srp_dev->mr->rkey;
2985 target->cmd_sg_cnt = cmd_sg_entries;
c07d424d
DD		 2986 target->sg_tablesize = indirect_sg_entries ? : cmd_sg_entries;
2987 target->allow_ext_sg = allow_ext_sg;
7bb312e4 2988 target->tl_retry_count = 7;
4d73f95f 2989 target->queue_size = SRP_DEFAULT_QUEUE_SIZE;
aef9ec39 2990
2d7091bc
BVA		 2991 mutex_lock(&host->add_target_mutex);
2992
aef9ec39
RD		 2993 ret = srp_parse_options(buf, target);
2994 if (ret)
2995 goto err;
2996
4d73f95f
BVA		 2997 target->req_ring_size = target->queue_size - SRP_TSK_MGMT_SQ_SIZE;
2998
96fc248a
BVA		 2999 if (!srp_conn_unique(target->srp_host, target)) {
3000 shost_printk(KERN_INFO, target->scsi_host,
3001 PFX "Already connected to target port with id_ext=%016llx;ioc_guid=%016llx;initiator_ext=%016llx\n",
3002 be64_to_cpu(target->id_ext),
3003 be64_to_cpu(target->ioc_guid),
3004 be64_to_cpu(target->initiator_ext));
3005 ret = -EEXIST;
3006 goto err;
3007 }
3008
5cfb1782 3009 if (!srp_dev->has_fmr && !srp_dev->has_fr && !target->allow_ext_sg &&
d1b4289e 3010 target->cmd_sg_cnt < target->sg_tablesize) {
5cfb1782 3011 pr_warn("No MR pool and no external indirect descriptors, limiting sg_tablesize to cmd_sg_cnt\n");
c07d424d
DD		 3012 target->sg_tablesize = target->cmd_sg_cnt;
3013 }
3014
3015 target_host->sg_tablesize = target->sg_tablesize;
3016 target->indirect_size = target->sg_tablesize *
3017 sizeof (struct srp_direct_buf);
49248644
DD		 3018 target->max_iu_len = sizeof (struct srp_cmd) +
3019 sizeof (struct srp_indirect_buf) +
3020 target->cmd_sg_cnt * sizeof (struct srp_direct_buf);
3021
c1120f89 3022 INIT_WORK(&target->tl_err_work, srp_tl_err_work);
ef6c49d8 3023 INIT_WORK(&target->remove_work, srp_remove_work);
8f26c9ff
DD		 3024 spin_lock_init(&target->lock);
3025 INIT_LIST_HEAD(&target->free_tx);
b81d00bd
BVA		 3026 ret = srp_alloc_req_data(target);
3027 if (ret)
3028 goto err_free_mem;
8f26c9ff 3029
2088ca66
SG		 3030 ret = ib_query_gid(ibdev, host->port, 0, &target->path.sgid);
3031 if (ret)
3032 goto err_free_mem;
aef9ec39 3033
aef9ec39
RD		 3034 ret = srp_create_target_ib(target);
3035 if (ret)
8f26c9ff 3036 goto err_free_mem;
aef9ec39 3037
9fe4bcf4
DD		 3038 ret = srp_new_cm_id(target);
3039 if (ret)
8f26c9ff 3040 goto err_free_ib;
aef9ec39
RD		 3041
3042 ret = srp_connect_target(target);
3043 if (ret) {
7aa54bd7
DD		 3044 shost_printk(KERN_ERR, target->scsi_host,
3045 PFX "Connection failed\n");
aef9ec39
RD		 3046 goto err_cm_id;
3047 }
3048
3049 ret = srp_add_target(host, target);
3050 if (ret)
3051 goto err_disconnect;
3052
e7ffde01
BVA		 3053 shost_printk(KERN_DEBUG, target->scsi_host, PFX
3054 "new target: id_ext %016llx ioc_guid %016llx pkey %04x service_id %016llx sgid %pI6 dgid %pI6\n",
3055 be64_to_cpu(target->id_ext),
3056 be64_to_cpu(target->ioc_guid),
3057 be16_to_cpu(target->path.pkey),
3058 be64_to_cpu(target->service_id),
3059 target->path.sgid.raw, target->path.dgid.raw);
3060
2d7091bc
BVA		 3061 ret = count;
3062
3063out:
3064 mutex_unlock(&host->add_target_mutex);
3065 return ret;
aef9ec39
RD		 3066
3067err_disconnect:
3068 srp_disconnect_target(target);
3069
3070err_cm_id:
3071 ib_destroy_cm_id(target->cm_id);
3072
8f26c9ff 3073err_free_ib:
aef9ec39
RD		 3074 srp_free_target_ib(target);
3075
8f26c9ff
DD		 3076err_free_mem:
3077 srp_free_req_data(target);
3078
aef9ec39
RD		 3079err:
3080 scsi_host_put(target_host);
2d7091bc 3081 goto out;
aef9ec39
RD		 3082}
3083
ee959b00 3084static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
aef9ec39 3085
ee959b00
TJ		 3086static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
3087 char *buf)
aef9ec39 3088{
ee959b00 3089 struct srp_host *host = container_of(dev, struct srp_host, dev);
aef9ec39 3090
05321937 3091 return sprintf(buf, "%s\n", host->srp_dev->dev->name);
aef9ec39
RD		 3092}
3093
ee959b00 3094static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
aef9ec39 3095
ee959b00
TJ		 3096static ssize_t show_port(struct device *dev, struct device_attribute *attr,
3097 char *buf)
aef9ec39 3098{
ee959b00 3099 struct srp_host *host = container_of(dev, struct srp_host, dev);
aef9ec39
RD		 3100
3101 return sprintf(buf, "%d\n", host->port);
3102}
3103
ee959b00 3104static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
aef9ec39 3105
f5358a17 3106static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
aef9ec39
RD		 3107{
3108 struct srp_host *host;
3109
3110 host = kzalloc(sizeof *host, GFP_KERNEL);
3111 if (!host)
3112 return NULL;
3113
3114 INIT_LIST_HEAD(&host->target_list);
b3589fd4 3115 spin_lock_init(&host->target_lock);
aef9ec39 3116 init_completion(&host->released);
2d7091bc 3117 mutex_init(&host->add_target_mutex);
05321937 3118 host->srp_dev = device;
aef9ec39
RD		 3119 host->port = port;
3120
ee959b00
TJ		 3121 host->dev.class = &srp_class;
3122 host->dev.parent = device->dev->dma_device;
d927e38c 3123 dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port);
aef9ec39 3124
ee959b00 3125 if (device_register(&host->dev))
f5358a17 3126 goto free_host;
ee959b00 3127 if (device_create_file(&host->dev, &dev_attr_add_target))
aef9ec39 3128 goto err_class;
ee959b00 3129 if (device_create_file(&host->dev, &dev_attr_ibdev))
aef9ec39 3130 goto err_class;
ee959b00 3131 if (device_create_file(&host->dev, &dev_attr_port))
aef9ec39
RD		 3132 goto err_class;
3133
3134 return host;
3135
3136err_class:
ee959b00 3137 device_unregister(&host->dev);
aef9ec39 3138
f5358a17 3139free_host:
aef9ec39
RD		 3140 kfree(host);
3141
3142 return NULL;
3143}
3144
3145static void srp_add_one(struct ib_device *device)
3146{
f5358a17
RD		 3147 struct srp_device *srp_dev;
3148 struct ib_device_attr *dev_attr;
aef9ec39 3149 struct srp_host *host;
52ede08f
BVA		 3150 int mr_page_shift, s, e, p;
3151 u64 max_pages_per_mr;
aef9ec39 3152
f5358a17
RD		 3153 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
3154 if (!dev_attr)
cf311cd4 3155 return;
aef9ec39 3156
f5358a17 3157 if (ib_query_device(device, dev_attr)) {
e0bda7d8 3158 pr_warn("Query device failed for %s\n", device->name);
f5358a17
RD		 3159 goto free_attr;
3160 }
3161
3162 srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
3163 if (!srp_dev)
3164 goto free_attr;
3165
d1b4289e
BVA		 3166 srp_dev->has_fmr = (device->alloc_fmr && device->dealloc_fmr &&
3167 device->map_phys_fmr && device->unmap_fmr);
5cfb1782
BVA		 3168 srp_dev->has_fr = (dev_attr->device_cap_flags &
3169 IB_DEVICE_MEM_MGT_EXTENSIONS);
3170 if (!srp_dev->has_fmr && !srp_dev->has_fr)
3171 dev_warn(&device->dev, "neither FMR nor FR is supported\n");
3172
3173 srp_dev->use_fast_reg = (srp_dev->has_fr &&
3174 (!srp_dev->has_fmr || prefer_fr));
d1b4289e 3175
f5358a17
RD		 3176 /*
3177 * Use the smallest page size supported by the HCA, down to a
8f26c9ff
DD		 3178 * minimum of 4096 bytes. We're unlikely to build large sglists
3179 * out of smaller entries.
f5358a17 3180 */
52ede08f
BVA		 3181 mr_page_shift = max(12, ffs(dev_attr->page_size_cap) - 1);
3182 srp_dev->mr_page_size = 1 << mr_page_shift;
3183 srp_dev->mr_page_mask = ~((u64) srp_dev->mr_page_size - 1);
3184 max_pages_per_mr = dev_attr->max_mr_size;
3185 do_div(max_pages_per_mr, srp_dev->mr_page_size);
3186 srp_dev->max_pages_per_mr = min_t(u64, SRP_MAX_PAGES_PER_MR,
3187 max_pages_per_mr);
5cfb1782
BVA		 3188 if (srp_dev->use_fast_reg) {
3189 srp_dev->max_pages_per_mr =
3190 min_t(u32, srp_dev->max_pages_per_mr,
3191 dev_attr->max_fast_reg_page_list_len);
3192 }
52ede08f
BVA		 3193 srp_dev->mr_max_size = srp_dev->mr_page_size *
3194 srp_dev->max_pages_per_mr;
5cfb1782 3195 pr_debug("%s: mr_page_shift = %d, dev_attr->max_mr_size = %#llx, dev_attr->max_fast_reg_page_list_len = %u, max_pages_per_mr = %d, mr_max_size = %#x\n",
52ede08f 3196 device->name, mr_page_shift, dev_attr->max_mr_size,
5cfb1782 3197 dev_attr->max_fast_reg_page_list_len,
52ede08f 3198 srp_dev->max_pages_per_mr, srp_dev->mr_max_size);
f5358a17
RD		 3199
3200 INIT_LIST_HEAD(&srp_dev->dev_list);
3201
3202 srp_dev->dev = device;
3203 srp_dev->pd = ib_alloc_pd(device);
3204 if (IS_ERR(srp_dev->pd))
3205 goto free_dev;
3206
3207 srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
3208 IB_ACCESS_LOCAL_WRITE |
3209 IB_ACCESS_REMOTE_READ |
3210 IB_ACCESS_REMOTE_WRITE);
3211 if (IS_ERR(srp_dev->mr))
3212 goto err_pd;
3213
07ebafba 3214 if (device->node_type == RDMA_NODE_IB_SWITCH) {
aef9ec39
RD		 3215 s = 0;
3216 e = 0;
3217 } else {
3218 s = 1;
3219 e = device->phys_port_cnt;
3220 }
3221
3222 for (p = s; p <= e; ++p) {
f5358a17 3223 host = srp_add_port(srp_dev, p);
aef9ec39 3224 if (host)
f5358a17 3225 list_add_tail(&host->list, &srp_dev->dev_list);
aef9ec39
RD		 3226 }
3227
f5358a17
RD		 3228 ib_set_client_data(device, &srp_client, srp_dev);
3229
3230 goto free_attr;
3231
3232err_pd:
3233 ib_dealloc_pd(srp_dev->pd);
3234
3235free_dev:
3236 kfree(srp_dev);
3237
3238free_attr:
3239 kfree(dev_attr);
aef9ec39
RD		 3240}
3241
3242static void srp_remove_one(struct ib_device *device)
3243{
f5358a17 3244 struct srp_device *srp_dev;
aef9ec39 3245 struct srp_host *host, *tmp_host;
ef6c49d8 3246 struct srp_target_port *target;
aef9ec39 3247
f5358a17 3248 srp_dev = ib_get_client_data(device, &srp_client);
1fe0cb84
DB		 3249 if (!srp_dev)
3250 return;
aef9ec39 3251
f5358a17 3252 list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
ee959b00 3253 device_unregister(&host->dev);
aef9ec39
RD		 3254 /*
3255 * Wait for the sysfs entry to go away, so that no new
3256 * target ports can be created.
3257 */
3258 wait_for_completion(&host->released);
3259
3260 /*
ef6c49d8 3261 * Remove all target ports.
aef9ec39 3262 */
b3589fd4 3263 spin_lock(&host->target_lock);
ef6c49d8
BVA		 3264 list_for_each_entry(target, &host->target_list, list)
3265 srp_queue_remove_work(target);
b3589fd4 3266 spin_unlock(&host->target_lock);
aef9ec39
RD		 3267
3268 /*
bcc05910 3269 * Wait for tl_err and target port removal tasks.
aef9ec39 3270 */
ef6c49d8 3271 flush_workqueue(system_long_wq);
bcc05910 3272 flush_workqueue(srp_remove_wq);
aef9ec39 3273
aef9ec39
RD		 3274 kfree(host);
3275 }
3276
f5358a17
RD		 3277 ib_dereg_mr(srp_dev->mr);
3278 ib_dealloc_pd(srp_dev->pd);
3279
3280 kfree(srp_dev);
aef9ec39
RD		 3281}
3282
3236822b 3283static struct srp_function_template ib_srp_transport_functions = {
ed9b2264
BVA		 3284 .has_rport_state = true,
3285 .reset_timer_if_blocked = true,
a95cadb9 3286 .reconnect_delay = &srp_reconnect_delay,
ed9b2264
BVA		 3287 .fast_io_fail_tmo = &srp_fast_io_fail_tmo,
3288 .dev_loss_tmo = &srp_dev_loss_tmo,
3289 .reconnect = srp_rport_reconnect,
dc1bdbd9 3290 .rport_delete = srp_rport_delete,
ed9b2264 3291 .terminate_rport_io = srp_terminate_io,
3236822b
FT		 3292};
3293
aef9ec39
RD		 3294static int __init srp_init_module(void)
3295{
3296 int ret;
3297
dcb4cb85 3298 BUILD_BUG_ON(FIELD_SIZEOF(struct ib_wc, wr_id) < sizeof(void *));
dd5e6e38 3299
49248644 3300 if (srp_sg_tablesize) {
e0bda7d8 3301 pr_warn("srp_sg_tablesize is deprecated, please use cmd_sg_entries\n");
49248644
DD		 3302 if (!cmd_sg_entries)
3303 cmd_sg_entries = srp_sg_tablesize;
3304 }
3305
3306 if (!cmd_sg_entries)
3307 cmd_sg_entries = SRP_DEF_SG_TABLESIZE;
3308
3309 if (cmd_sg_entries > 255) {
e0bda7d8 3310 pr_warn("Clamping cmd_sg_entries to 255\n");
49248644 3311 cmd_sg_entries = 255;
1e89a194
DD		 3312 }
3313
c07d424d
DD		 3314 if (!indirect_sg_entries)
3315 indirect_sg_entries = cmd_sg_entries;
3316 else if (indirect_sg_entries < cmd_sg_entries) {
e0bda7d8
BVA		 3317 pr_warn("Bumping up indirect_sg_entries to match cmd_sg_entries (%u)\n",
3318 cmd_sg_entries);
c07d424d
DD		 3319 indirect_sg_entries = cmd_sg_entries;
3320 }
3321
bcc05910
BVA		 3322 srp_remove_wq = create_workqueue("srp_remove");
3323 if (IS_ERR(srp_remove_wq)) {
3324 ret = PTR_ERR(srp_remove_wq);
3325 goto out;
3326 }
3327
3328 ret = -ENOMEM;
3236822b
FT		 3329 ib_srp_transport_template =
3330 srp_attach_transport(&ib_srp_transport_functions);
3331 if (!ib_srp_transport_template)
bcc05910 3332 goto destroy_wq;
3236822b 3333
aef9ec39
RD		 3334 ret = class_register(&srp_class);
3335 if (ret) {
e0bda7d8 3336 pr_err("couldn't register class infiniband_srp\n");
bcc05910 3337 goto release_tr;
aef9ec39
RD		 3338 }
3339
c1a0b23b
MT		 3340 ib_sa_register_client(&srp_sa_client);
3341
aef9ec39
RD		 3342 ret = ib_register_client(&srp_client);
3343 if (ret) {
e0bda7d8 3344 pr_err("couldn't register IB client\n");
bcc05910 3345 goto unreg_sa;
aef9ec39
RD		 3346 }
3347
bcc05910
BVA		 3348out:
3349 return ret;
3350
3351unreg_sa:
3352 ib_sa_unregister_client(&srp_sa_client);
3353 class_unregister(&srp_class);
3354
3355release_tr:
3356 srp_release_transport(ib_srp_transport_template);
3357
3358destroy_wq:
3359 destroy_workqueue(srp_remove_wq);
3360 goto out;
aef9ec39
RD		 3361}
3362
3363static void __exit srp_cleanup_module(void)
3364{
3365 ib_unregister_client(&srp_client);
c1a0b23b 3366 ib_sa_unregister_client(&srp_sa_client);
aef9ec39 3367 class_unregister(&srp_class);
3236822b 3368 srp_release_transport(ib_srp_transport_template);
bcc05910 3369 destroy_workqueue(srp_remove_wq);
aef9ec39
RD		 3370}
3371
3372module_init(srp_init_module);
3373module_exit(srp_cleanup_module);
Linux kernel - Deliverables
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